Car, trailer or garden lights
You want an assorted solder-seal kit with a long UK file. The Kuject 120-piece box is about £9.99, with 4.6 from about 45,437 reviews. You still supply the heat gun, and you match colour to gauge.
Solder connectors comparison 2026
The best solder connectors, compared.
Top pick: shengbowi 400-piece heat gun kit Best value: Bitone 100-piece solder connectors – Lowest shelf price, about £3.49 for 100 pieces. 4.3 from 65 reviews, so the file is shorter than the Kuject line. Updated October 2026.
A polyolefin sleeve holds a ring of solder and adhesive. You shrink it with a heat gun, not with a crimp tool and not with a lighter. UK shoppers use them on cars, trailers, caravans, boats, garden lights and hobby looms when they want a compact inline join. It is not a junction box for mains hidden in a wall. A stored heat-gun flag is not treated as a gun in the box unless the title says so. Match the colour to the wire size, and heat until the solder wets. The [solder connectors buying guide](/hub/soldering-and-welding/solder-connectors/sub/solder-connectors-buying-guide) puts gauge and heat in order. A solder connector is a solder-seal butt splice. A heat gun melts the ring and shrinks the tube. A crimp tool is not the method, and a lighter chars the plastic.
A polyolefin sleeve holds a ring of solder and adhesive. You shrink it with a heat gun, not with a crimp tool and not with a lighter.
40 products checked · 58 hrs invested · +21,700 readers
12 of 12: Best solder connectors compared
Swipe for more
1-2 of 12Best overall
Best value
10.0/10
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∼ £30
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5.0(5)
5.0(2)
4.6(45,437)
4.6(45,437)
4.6(223)
4.5(3,405)
4.5(1,408)
4.5(1,216)
4.5(14)
4.4(860)
4.4(285)
4.3(65)
Personal buying guide
Which solder connectors fit?
Question 1 of 2
What are you joining?
The best solder connectors in detail
Our view
This shengbowi bundle at about £29.99 pairs 400 solder-seal pieces with a mini 300 W heat gun in the title. It is the only row here where the assessment treats the gun as part of the box. The capture shows 5.0 from five UK reviews, so the stars are early feedback and they do not take the top pick. Quick-connect wording appears beside butt terminals, which may mean mixed styles. Confirm the photos before you assume every piece is an inline splice. Weight is about 540 g, which fits a gun plus a case. It is the most expensive row. It makes sense if you need both the sleeves and a first gun. A 300 W mini gun is for light sleeves. Large yellow sizes may still want a stronger gun.
Pros
- 400 pieces and a mini 300 W gun in the title
- Highest piece count in the set
- Case flagged
- Dual-wall adhesive claimed
Cons
- 5.0 from only 5 reviews
- About £29.99
- Connector type mixes quick-connect and butt wording
Best for: You have no heat gun and you want a large kit and a tool together.
Less suitable: You judge a kit mainly by thousands of UK reviews.
Specifications
- Model
- shengbowi 400-piece heat gun kit
- Brand
- shengbowi
- Price
- ∼£30
- Customer rating
- 5.0/5(5)
- Waterproof
- Dual-wall
- Pieces
- 400
- Heat gun
- Yes
- Case
- Yes
- Type
- Mixed
Common questions
Is the 300 W gun enough for every sleeve?
The title includes a mini 300 W gun for this 400-piece kit. Listings in the category often cite about 230-450 °C, and large yellow sizes need a capable gun. Reviews of this bundle are five lines at 5.0, so melt-through on a thick sleeve is not shown.
Are all 400 pieces butt splices?
The stored connector type says quick connect, and the details also mention butt terminals. Look at the photos. Do not assume a rainbow of inline splices only.
Our view
Fyntave's 200-piece pack at about £8.98 is red 22-18 AWG heat-shrink butt connectors, for automotive, marine and DIY lighting according to the title. That single colour suits a trailer lamp circuit on one gauge. It does not cover a whole vehicle. The capture shows 5.0 from two UK reviews, so the score is not a quality signal and it does not take a badge. No heat gun is listed. The case cell is blank. The stored AWG line says a mixed set, while the title and the assessment say red 22-18 only, so the table follows the title. If you also need blue or yellow, buy an assorted box.
Pros
- 200 red sleeves for 22-18 AWG
- Useful if that gauge repeats
- About £8.98
- No crimp tool
Cons
- 5.0 from only 2 reviews
- No heat gun
- Not an assorted kit
Best for: You mostly join 22-18 AWG lighting conductors.
Less suitable: You need mixed colours, or a review file longer than two lines.
Specifications
- Model
- Fyntave 200 red solder connectors
- Brand
- Fyntave
- Price
- ∼£9
- Customer rating
- 5.0/5(2)
- Crimp tool
- No
- Waterproof
- Dual-wall
- Pieces
- 200
- Wire sizes
- 22-18 AWG
- Heat gun
- No
- Type
- Butt splice
Common questions
Is the Fyntave pack mixed colours?
The title says 200 red sleeves for 22-18 AWG. The stored AWG field says a mixed set. Trust the title and the photos. It is a single-gauge bulk pack, not a four-colour case.
Why is 5.0 from two reviews not ranked first?
Two reviews cannot show melt, adhesive or gauge mistakes. The Kuject line is 4.6 from about 45,437 reviews. The display score of 100 on this row is the star line scaled, and the badge rules do not use it.
Our view
The Kuject 120-piece kit at about £9.99 sits in the core price band with a storage case and no crimp tool. amazon.co.uk shows 4.6 from about 45,437 reviews, which is unusually deep for this category and is why it is the top pick for an assorted butt splice. Listings describe dual-wall adhesive activated with a heat gun, not a lighter. You still match sleeve colour to wire size and heat from the centre out until the solder ring wets the strands. The stored comparison leaves piece-count breakdown and AWG bands blank, and it flags a heat gun as included. The assessment does not describe a gun in this box, so the table leaves that cell blank. Check the live listing before you rely on yellow sleeves for thick cable.
Pros
- 4.6 from about 45,437 reviews
- About £9.99 with a storage case
- No crimp tool on the listing
- Dual-wall adhesive claimed
Cons
- Colour split and AWG bands not in the stored fields
- The heat-gun flag does not describe a gun in the box
- The 50-piece Kuject row shares this star line
Best for: You want a mainstream assorted solder-seal kit with a long review file.
Less suitable: You need a verified 400-piece tool bundle, or only one gauge.
Specifications
- Model
- Kuject 120-piece solder connectors
- Brand
- Kuject
- Price
- ∼£10
- Customer rating
- 4.6/5(45,437)
- Crimp tool
- No
- Waterproof
- Dual-wall
- Pieces
- 120
- Case
- Yes
- Type
- Butt splice
Common questions
Does the Kuject 120-piece kit include a heat gun?
The stored flag says yes. The product notes say you still activate the sleeve with a gun you supply, and they warn that the flag can mean the workflow rather than a tool in the box. The only title in this set that names a 300 W gun is the shengbowi bundle.
Is 45,437 reviews only the 120-piece box?
The 50-piece Kuject row shows the same 4.6 from about 45,437 reviews. Treat it as a shared line, not as two independent samples. The 120-piece title is the assorted kit at about £9.99.
Our view
This Kuject 50-piece pack at about £6.99 is the smaller box in the same line, aimed at marine and automotive butt splices with the same heat-gun workflow. It shares 4.6 from about 45,437 reviews with the 120-piece kit, which likely reflects a parent listing rather than an independent sample of this box. You still need a heat gun to melt the solder and the adhesive. Fifty sleeves can cover a one-off trailer lamp. A full rewire will empty the pack. The capture weight is about 18 g, so do not assume a heavy case or a gun is inside. The heat-gun cell stays blank for the same reason as the 120-piece row.
Pros
- About £6.99
- Butt-splice wording for vehicle and boat use
- No crimp tool
- Case flagged
Cons
- 50 pieces, so a rewire means a reorder
- The review count is the shared Kuject line
- AWG bands not in the stored fields
Best for: A small automotive or marine repair, a handful of inline joins.
Less suitable: A caravan rewire, or proof that is specific to this box size.
Specifications
- Model
- Kuject 50-piece solder connectors
- Brand
- Kuject
- Price
- ∼£7
- Customer rating
- 4.6/5(45,437)
- Crimp tool
- No
- Waterproof
- Dual-wall
- Pieces
- 50
- Case
- Yes
- Type
- Butt splice
Common questions
How is the 50-piece Kuject different from the 120-piece kit?
The shelf price is about £6.99 against about £9.99, and the title count is 50 against 120. The star line is the same 4.6 from about 45,437 reviews. The 120-piece kit is the top pick. This pack is the smaller buy.
Is 18 g a full kit?
That is the captured weight. It is light for a case and a gun. Do not expect the 300 W bundle. Budget a heat gun separately.
Our view
The greate kit at about £11.99 lists IP67 wording and a 230-400 °C band, which matches the gun settings many solder-seal pages mention. amazon.co.uk shows 4.6 from about 223 reviews, a strong average on a small sample next to Kuject. The matrix marks no bundled heat gun, so budget for a two-stage gun if you do not own one. Mixed AWG colours are noted, and no crimp tool is required. A case is included. The title says 200 pieces and the stored count is blank, so the table uses 200 from the title. IP67 is a listing claim. It is not a lab result. Look for adhesive at both ends after you heat.
Pros
- 4.6 from 223 reviews
- IP67 claim and a 230-400 °C band
- No crimp tool
- Case included
Cons
- No heat gun, despite the IP67 line
- Piece count blank in the stored field
- 223 reviews, far below the Kuject line
Best for: You already own a heat gun and you want an IP67-marketed sleeve.
Less suitable: A first checkout that must include a mini gun.
Specifications
- Model
- greate 200-piece solder connectors
- Brand
- greate
- Price
- ∼£12
- Customer rating
- 4.6/5(223)
- Crimp tool
- No
- Waterproof
- IP67 claim
- Pieces
- 200
- Wire sizes
- Mixed
- Heat gun
- No
- Case
- Yes
- Type
- Butt splice
Common questions
Does IP67 mean the join was tested?
No. The listing claims IP67. This page did not run an ingress test. The seal still depends on solder wetting and adhesive flow at both ends, and on the right colour for the wire.
What temperature does the greate listing state?
230-400 °C on the capture. That is a gun-setting band, not a measured tip temperature. The kit does not include the gun.
Our view
Feggizuli's 150-piece kit at about £8.99 markets marine-style heat-shrink butt splices with an IP67 claim. No independent test is implied. amazon.co.uk shows about 4.5 from 3,405 reviews, a healthier file than the tiny listings and still far smaller than Kuject. The assortment is a mixed AWG colour set, and no crimp tool is required. IP67 on the box does not replace heating until the solder wets and the adhesive seals the ends. Vibration on a trailer still wants strain relief and the right gauge. The case cell is blank, so expect a simple pouch unless the photos show more. Shrink ratio is not stored.
Pros
- IP67 claim on the capture
- 4.5 from about 3,405 reviews
- 150 pieces, mixed colours
- About £8.99
Cons
- IP67 is a listing claim
- Shrink ratio not stored
- Case not confirmed
Best for: A caravan, boat or trailer kit that advertises stronger ingress wording.
Less suitable: A concealed mains joint, where a sleeve is not the BS 7671 enclosure.
Specifications
- Model
- Feggizuli 150-piece solder connectors
- Brand
- Feggizuli
- Price
- ∼£9
- Customer rating
- 4.5/5(3,405)
- Crimp tool
- No
- Waterproof
- IP67 claim
- Pieces
- 150
- Wire sizes
- Mixed
- Type
- Butt splice
Common questions
Does the Feggizuli kit include a case?
The stored case field is blank. Do not assume a organiser. The count is 150 mixed-colour butt splices at about £8.99.
Can I use these sleeves inside a wall?
No. A solder-seal sleeve is insulation for an inline low-voltage or vehicle join you can inspect. Concealed mains joints need a suitable enclosure under BS 7671. When the circuit is notifiable, use a registered electrician.
Our view
ELECTRAPICK's 180-piece kit at about £7.99 is in the budget-to-core band, with a stated 2:1 shrink and a mixed colour set. amazon.co.uk shows 4.5 from about 1,408 reviews, solid and smaller than the Kuject block. The matrix marks dual-wall adhesive and a case. Heat-gun activation is still required. A captured sleeve temperature of 125 °C describes the tubing, not the gun setting. Treat waterproof wording as marketing until you see adhesive at both ends. The stored heat-gun flag is the same generic Yes seen on kits that do not describe a gun, so the table leaves it blank.
Pros
- 180 pieces at about £7.99 with a case
- 4.5 from about 1,408 reviews
- 2:1 shrink listed
- Mixed colours
Cons
- Smaller file than Kuject
- Heat-gun flag is not a gun in the box
- Model field in the raw details is not a useful name
Best for: Home and garden fixes where you want more than 50 pieces and no gun bundle.
Less suitable: You want a mini heat gun in the same box.
Specifications
- Model
- ELECTRAPICK 180-piece solder connectors
- Brand
- ELECTRAPICK
- Price
- ∼£8
- Customer rating
- 4.5/5(1,408)
- Crimp tool
- No
- Waterproof
- Dual-wall
- Pieces
- 180
- Wire sizes
- Mixed
- Shrink ratio
- 2:1
- Case
- Yes
- Type
- Butt splice
Common questions
What does 2:1 shrink mean here?
The listing states a 2:1 shrink ratio on the sleeve. That is how far the tube is claimed to recover. It is not a measure of solder volume or of a waterproof test.
Is 125 °C the gun temperature?
No. The capture uses 125 °C as a tubing rating. Gun settings quoted across this category are often about 230-450 °C. Use a gun that melts the ring without charring the sleeve.
Our view
ZIPCCI's 350-piece kit at about £19.99 is the large-count option for trailer, automotive and DIY users who expect to use sleeves over a season. The capture shows 4.5 from about 1,216 reviews and lists dual-wall adhesive with heat-gun activation. You are paying for volume, not for a bundled tool. The assessment states no heat gun in this comparison row, so the table says No even though a generic flag elsewhere says Yes. Weight is about 250 g, which suggests a fuller case than the lightest packs. The case cell itself is blank. If you only join three lamp wires, a 100-piece pack is the closer buy.
Pros
- 350 pieces for repeat repairs
- 4.5 from about 1,216 reviews
- About £19.99
- Automotive and trailer wording
Cons
- No heat gun in this row
- AWG mix not in the stored fields
- Most of the box sits unused on a three-wire job
Best for: You regularly heat-seal harness repairs and you already own a gun.
Less suitable: One garden light, where a 100-piece pack is enough.
Specifications
- Model
- ZIPCCI 350-piece solder connectors
- Brand
- ZIPCCI
- Price
- ∼£20
- Customer rating
- 4.5/5(1,216)
- Waterproof
- Dual-wall
- Pieces
- 350
- Heat gun
- No
- Type
- Butt splice
Common questions
Does the ZIPCCI kit include a heat gun?
No. The assessment for this row says the gun is not included. You pay about £19.99 for 350 sleeves. The 400-piece shengbowi row is the one that names a 300 W gun, at about £29.99.
When is 350 pieces too many?
When the job is a few lamp wires. Most of the box will sit unused. A 100-piece pack is the closer match, and you can reorder a single colour later.
Our view
PERSENTU's 100-piece kit at about £5.59 is a low shelf price, with five connector types named for marine and automotive joints. Stars sit at 4.5 from only 14 UK reviews, so batch differences are hard to see. A 2:1 shrink and a case are noted, and no crimp tool is required. At this price the solder ring and the adhesive can differ from a kit with tens of thousands of reviews. Inspect the first join before you seal a harness you cannot revisit. It fits a glove box more than a season of workshop use. The heat-gun cell is blank because the stored Yes is the same generic flag, not a described gun.
Pros
- About £5.59 for 100 pieces
- Five types named in the title
- 2:1 shrink and a case
- No crimp tool
Cons
- Only 14 reviews
- 100 pieces go quickly
- The seal still depends on technique
Best for: A glove-box kit and an occasional trailer or boat fix.
Less suitable: Heavy use, or a file you want in the hundreds of reviews.
Specifications
- Model
- PERSENTU 100-piece solder connectors
- Brand
- PERSENTU
- Price
- ∼£6
- Customer rating
- 4.5/5(14)
- Crimp tool
- No
- Waterproof
- Dual-wall
- Pieces
- 100
- Shrink ratio
- 2:1
- Case
- Yes
- Type
- Butt splice
Common questions
How does PERSENTU differ from Bitone at 100 pieces?
PERSENTU is about £5.59 with 4.5 from 14 reviews. Bitone is about £3.49 with 4.3 from 65 reviews and is the best value. Both claim a 2:1 shrink and a case. Neither has the Kuject review depth.
What should you inspect on the first join?
Solder should wet the strands before the tube finishes shrinking, and adhesive should show at both ends. A cold ring under a shiny sleeve is a failed join. Fourteen reviews will not show every batch.
Our view
Gorffy's 210-piece kit at about £8.98 pushes the count above many £9 rivals and stays in the same price pocket. amazon.co.uk shows 4.4 from about 860 reviews, slightly below the 4.5 tier and still a usable UK signal. Dual-wall adhesive and a case are flagged. Heat-gun use is the activation path. Whether a crimp tool is required is blank, so follow the solder-seal title rather than a crimp step. One technical field reads as a crimp connector, which looks like a catalogue mismatch. Trust the heat-shrink solder-seal title. AWG bands are not in the stored fields.
Pros
- 210 pieces under £9
- Case flagged
- 4.4 from about 860 reviews
- Dual-wall adhesive claimed
Cons
- 4.4 trails the 4.5 and 4.6 kits
- AWG coverage not stored
- A technical field says crimp, which clashes with the title
Best for: You want more pieces per pound in an assorted kit.
Less suitable: You want the highest star line, or a gauge table in the stored fields.
Specifications
- Model
- Gorffy 210-piece solder connectors
- Brand
- Gorffy
- Price
- ∼£9
- Customer rating
- 4.4/5(860)
- Waterproof
- Dual-wall
- Pieces
- 210
- Case
- Yes
- Type
- Butt splice
Common questions
Do I crimp the Gorffy sleeves?
No. The title is a solder-seal heat-shrink butt connector. One stored field says crimp, and that clashes with the product type. Heat the sleeve. Do not add a crimp tool unless the live photos show crimp terminals.
How many pieces are in the box?
The stored count is 210, at about £8.98. AWG coverage is blank, so read the colour key on the listing before you buy it for one gauge only.
Our view
ANVINKU's 280-piece kit at about £12.59 sits between the core kits and the 350-piece ZIPCCI box, with a case and mixed colours. The review sample is modest: 4.4 from about 285 UK reviews, so read recent comments on melt before you commit. No crimp tool is required, and dual-wall adhesive is listed. A model name in the technical details uses a German word for solder connectors. That is a catalogue leftover on a UK listing, not a spec. For caravan prep, 280 assorted sleeves can make sense if you already own a capable heat gun. Shrink ratio is not stored. The heat-gun cell stays blank.
Pros
- 280 pieces with a case at about £12.59
- Mixed colours
- No crimp tool
- Dual-wall adhesive listed
Cons
- 285 reviews, smaller than the thousand-review kits
- 4.4 is not the highest line
- Shrink ratio not stated
Best for: You want a larger assorted case without the 350-piece price.
Less suitable: You use review count as the main quality signal.
Specifications
- Model
- ANVINKU 280-piece solder connectors
- Brand
- ANVINKU
- Price
- ∼£13
- Customer rating
- 4.4/5(285)
- Crimp tool
- No
- Waterproof
- Dual-wall
- Pieces
- 280
- Wire sizes
- Mixed
- Case
- Yes
- Type
- Butt splice
Common questions
How does 280 pieces compare with the ZIPCCI kit?
ANVINKU is 280 pieces at about £12.59 with 4.4 from 285 reviews and a case flagged. ZIPCCI is 350 pieces at about £19.99 with 4.5 from about 1,216 reviews and no gun. You pay more for count and for a longer file.
Do I need my own heat gun?
Yes. The listing does not describe a gun in the box. Heat until the solder wets, then let the adhesive flow at the ends. A lighter chars the sleeve.
Our view
Bitone's pack at about £3.49 is the best value row. The title is 30 plus 70 pieces, and the stored count is 100 solder-seal terminals with sealant. amazon.co.uk shows 4.3 from 65 reviews, below several 4.5 kits and at a fraction of the price. Mixed AWG colours, 2:1 shrink, a case and no crimp tool are on the capture. The low price suits learning the heat sequence on scrap before a caravan loom. Some listings in this tier draw comments about thin walls or solder that is slow to melt. The matrix still expects a heat gun. It does not put one in the box. Do not use the first join you have never inspected as the joint you cannot reach again.
Pros
- About £3.49 for 100 pieces
- Lowest shelf price in the set
- 2:1 shrink, mixed colours and a case
- No crimp tool
Cons
- 4.3 from 65 reviews
- Trails the 4.5 and 4.6 kits
- You still need a capable gun
Best for: You are practising solder-seal joins on garden and hobby circuits.
Less suitable: A critical marine harness where you want thousands of reviews on the SKU.
Specifications
- Model
- Bitone 100-piece solder connectors
- Brand
- Bitone
- Price
- ∼£3
- Customer rating
- 4.3/5(65)
- Crimp tool
- No
- Waterproof
- Dual-wall
- Pieces
- 100
- Wire sizes
- Mixed
- Shrink ratio
- 2:1
- Case
- Yes
- Type
- Butt splice
Common questions
Why is the Bitone pack the best value at 4.3 stars?
It is about £3.49 for 100 pieces, the lowest shelf price, with a case and a 2:1 shrink. The Kuject 120-piece kit is the top pick because of about 45,437 reviews at 4.6, not because it is cheaper. Sixty-five reviews are enough to see a pattern and not enough to match that file.
What does 30 plus 70 mean?
The title splits the hundred pieces into two groups. The stored kit count is 100. Check the photo for how many of each colour you actually get.
How we compared
Twelve amazon.co.uk solder-seal kits were scored for this page. Weights sum to 100. An IP67 line, a piece count and a heat-gun flag are listing claims. There was no ingress test and no ampacity test. A star line under about 10 reviews does not take the top pick. The top pick is the Kuject 120-piece kit, on review depth. The best value is the Bitone 100-piece pack, on price per piece. A stored 'includes heat gun' Yes is left blank unless the title or the assessment says a gun is in the box.
1
Wire size match
25%White, red, blue and yellow map to common AWG bands. The wrong colour gives a cold joint or torn insulation. A single-colour bulk pack scores only for that band.
2
Heat source
20%Listings often cite about 230-450 °C. A large yellow sleeve needs a capable gun. A 300 W mini gun in the box scores only when the title includes it.
3
Seal design
20%Dual-wall polyolefin and hot-melt adhesive are the usual claim. IP67 on the title is not a lab result. The join depends on solder wetting and adhesive at both ends.
4
Kit size and price
15%About 100-280 pieces suit mixed DIY. A 400-piece box with a gun is a mobile kit. A 200-piece red pack suits one gauge. Price per piece is the value check.
5
Review depth
20%Stars with a very small count are a weak signal. One Kuject line is about 45,000 reviews at 4.6. A 5.0 from two or five reviews is not the same evidence.
Independent review
Last updated: October 2026
6 sources checked
Solder connectors buying guide
The checks run in this order: wire size, the heat gun, the seal you can see, the piece count, then the review file, then price. The table is twelve solder-seal kits. Ring terminals, blade terminals and lever connectors are a different product. None of these sleeves was ingress-tested for this page.
What is a solder connector?
A solder connector in this comparison is a solder-seal butt splice. The sleeve is polyolefin, with a ring of solder and bands of hot-melt adhesive. A heat gun melts the ring and shrinks the tube. A crimp tool is not the method, and a lighter chars the plastic. UK buyers use them on cars, trailers, caravans, boats, garden lighting and hobby looms when they want a short inline join that is meant to keep water out. The sleeve replaces the insulation you stripped.
Best for
- Inline joins on a vehicle, trailer, boat or garden light, with a heat gun
- You will match colour to gauge and look for adhesive at both ends
Not ideal for
- Concealed mains joints, where the sleeve is not the enclosure
- Ring terminals, blade terminals or lever connectors
Mistakes to avoid
- 1
Shrinking before the solder wets
The tube can look finished while the strands are dry. Heat the ring until it flows, then let the ends seal.
- 2
Using a sleeve as a mains junction
BS 7671 wants live conductors in a suitable enclosure. A solder-seal tube is not that box.
- 3
Heating with a flame
An open flame chars the sleeve. Use a heat gun, and keep fuel vapour and combustibles out of the path.
What to weigh up
Gauge, heat and the seal
HighColour is the gauge key. Mixed sets in the stored fields are ELECTRAPICK, Feggizuli, greate, Bitone and ANVINKU. Fyntave is 22-18 AWG red in the title. The other size cells are blank. A wrong sleeve is worse than a smaller kit. Then the gun. Only shengbowi names a 300 W gun in the title. greate states 230-400 °C and does not include the gun. IP67 is claimed on Feggizuli and greate and was not tested here. Dual-wall adhesive is the claim on the other rows.
How many pieces, and whose reviews
HighBitone is about £3.49 for 100 pieces and is the best value. PERSENTU is about £5.59 for 100, with 14 reviews. Kuject is about £6.99 for 50 and about £9.99 for 120, on one shared line of about 45,437 reviews at 4.6. ELECTRAPICK is 180 pieces at about £7.99 with about 1,408 reviews. Feggizuli is 150 at about £8.99 with about 3,405 reviews. Gorffy is 210 at about £8.98. greate is about 200 at about £11.99. ANVINKU is 280 at about £12.59. ZIPCCI is 350 at about £19.99.
Which option suits you?
Three typical situations, each with a recommendation from this comparison.
A first box on scrap wire
You want the lowest price per piece while you learn the heat sequence. The Bitone pack is about £3.49 for 100 pieces, 4.3 from 65 reviews. Practise before a loom you cannot reach again.
No heat gun in the drawer
You want sleeves and a mini gun in one checkout. The shengbowi bundle is about £29.99 for 400 pieces and a 300 W gun in the title. The star line is 5.0 from 5 reviews, so read the photos before you assume every piece is a butt splice.
Common questions about solder connectors
Which solder connectors are the top pick for 2026?
The top pick is the Kuject 120-piece solder-seal kit. amazon.co.uk shows 4.6 from about 45,437 reviews, at about £9.99, with a case and no crimp tool. The colour split is not in the stored fields, so check the live page for yellow sleeves if the cable is thick. You still need a heat gun. A 5.0 from five reviews on a gun bundle does not replace that file. The score is from the listing and the reviews, not from an IP test.
How much do solder connectors cost on amazon.co.uk?
In this scrape the shelf prices run from about £3.49 (Bitone, 100 pieces) and £5.59 (PERSENTU, 100) to £6.99 (Kuject, 50) and £7.99 (ELECTRAPICK, 180). About £8.98 to £9.99 covers Gorffy, Fyntave, Feggizuli and the Kuject 120-piece kit. ANVINKU is about £12.59 for 280 and greate about £11.99. ZIPCCI is about £19.99 for 350. The shengbowi gun bundle is about £29.99 for 400. These are prices for these ASINs, not a price per join for the market.
Do I need a crimp tool or a heat gun?
You need a heat gun, not a crimp tool, for a solder-seal butt splice. Heat the centre until the solder ring wets the strands, then let the tube shrink and the adhesive flow at the ends. A lighter chars the sleeve. In this set only the shengbowi title includes a mini 300 W gun. The greate, Fyntave and ZIPCCI rows do not. Other heat-gun cells are blank where a stored Yes did not match a gun in the box.
What do the connector colours mean?
On these kits, white, red, blue and yellow usually map to AWG bands. Red is often 22-18 AWG, which is the Fyntave title. The wrong colour gives a cold joint or torn insulation. Mixed kits in this set include ELECTRAPICK, Feggizuli, greate, Bitone and ANVINKU. Kuject, ZIPCCI, Gorffy, PERSENTU and shengbowi leave the band blank in the stored fields. Read the card in the box. Do not force a yellow sleeve onto a thin lighting wire.
Are solder-seal connectors waterproof?
They are sold as dual-wall sleeves with adhesive, and two rows claim IP67: Feggizuli and greate. That claim was not tested for this page. The result depends on technique. You should see solder wet the strands and adhesive at both ends. Vibration on a trailer still wants strain relief. A marine title does not make a bad heat cycle corrosion-proof. IP67 is not a reason to hide a mains joint in a wall.
Can I use solder connectors on mains wiring?
Not as the only enclosure for a concealed mains joint. BS 7671 expects a sound joint with live conductors in a suitable accessory or enclosure. A sleeve replaces insulation. It does not replace a junction box. Some domestic fixed wiring is notifiable under Part P. Vehicle and accessory repairs are a different risk. If you are unsure, or a circuit keeps tripping, use a registered electrician. De-energise before you work, and keep the gun away from fuel vapour.
How is this different from a reel of solder?
A solder-seal connector already holds a ring of solder and adhesive inside the sleeve. You do not feed a reel into the joint. A reel of solder is for a pad or a lug you heat with an iron. That comparison is the solder comparison. The alloy volume inside these sleeves is not stated, so do not treat two kits as the same metal. Heat the sleeve. Do not try to solder it with an iron tip through the plastic.
Solder-seal or a crimp?
Use a solder-seal sleeve when you want one heat cycle to bond and cover an inline join, and you can see adhesive at both ends. Use a crimp when you already trust a ratchet tool and a separate piece of heat-shrink, or when the joint must stay serviceable. The solder connectors or crimp page stays on that choice. This table is only the solder-seal kits. An open flame is the wrong heat source for either sleeve.
Our verdict
The top pick is the Kuject 120-piece kit at about £9.99, with 4.6 from about 45,437 reviews, a case and no crimp tool. The capture does not list the colour split, so check yellow sizes on the live page if the cable is thick. The best value is the Bitone pack at about £3.49 for 100 pieces, with 4.3 from 65 reviews. A 5.0 from five reviews on the £29.99 gun bundle, or from two reviews on a red-only pack, does not overtake the Kuject file. A sleeve is not an enclosure for concealed mains.
Best value
View offer
Bitone 100-piece solder connectors
Lowest shelf price, about £3.49 for 100 pieces. 4.3 from 65 reviews, so the file is shorter than the Kuject line.
Editorial
Editor
DIY & toolsSoldering and weldingamazon.co.uk listings
Peter F. is the editor for DIY & tools at productscompared.co.uk. Comparisons in this category are checked against amazon.co.uk listings, review evidence and public UK sources.
Updated: October 2026
6 sources checked
Guides to solder connectors
Guides on what to look for, how to use a product, and common mistakes.
Best solder connectorsTop pick and best value, and when to skip each kit.Solder connectors buying guideGauge, kit size and the heat gun, before the table.How to use solder connectorsHeat sequence, what a good join looks like, and when to stop.Solder connectors for vehiclesTrailer, caravan and boat joins, without a full ranking.Solder connectors or crimpOne heat cycle, or a crimp plus a separate sleeve.
Related comparisons
Sources
Sources taken from the research digest. The digest also points at the stored amazon.co.uk listings. Those are the product rows, not an extra public article.
- IET Wiring Matters: terminal blocks (retrieved 21.10.2026)
- BuildWiz UK: heat-shrink and enclosures (retrieved 21.10.2026)
- Voltimum: termination of conductors (retrieved 21.10.2026)
- Professional Electrician: enclosing connections (retrieved 21.10.2026)
- HSE: electricity (retrieved 21.10.2026)
- Haisstronica: heat shrink and solder-seal connectors (retrieved 21.10.2026)
This article contains affiliate links. If you buy through these links we may earn a small commission, at no extra cost to you. Prices, stars and review counts come from stored amazon.co.uk listings. We did not run a lab test.