Radiator pipe covers: measure the pipe before the packet
Updated: 23 October 2026
You are under a radiator with two bare copper tails and a hole in the floor, and every packet of radiator pipe covers seems to say 15 mm. That is the usual outside diameter on a UK heating circuit. The packet still has to match your pipe, the hole, and a valve that may already be tight. A sleeve hides the copper. A collar hides the hole. The [pipe cover comparison](/hub/diy-supplies/pipe-cover) lists the ten saved amazon.co.uk products. Measure first, then sleeve or collar, then clip-on or slide-on. Read on 21 October 2026, not a lab test. A qualifying purchase can earn a commission at no extra cost to you.
You are under a radiator with two bare copper tails and a hole in the floor, and every packet of radiator pipe covers seems to say 15 mm. That is the usual outside diameter on a UK heating circuit.
You are under a radiator with two bare copper tails and a hole in the floor, and every packet of radiator pipe covers seems to say 15 mm. That is the usual outside diameter on a UK heating circuit. The packet still has to match your pipe, the hole, and a valve that may already be tight. A sleeve hides the copper. A collar hides the hole. The pipe cover comparison lists the ten saved amazon.co.uk products. Measure first, then sleeve or collar, then clip-on or slide-on. Read on 21 October 2026, not a lab test. A qualifying purchase can earn a commission at no extra cost to you.
Our top picks
| Badge | Product | In the bag | How it goes on | Size stated | Note | Price | Offer |
|---|---|---|---|---|---|---|---|
| Best overall |  UK Radiators UK Radiators brass sleeves, pair | 2 sleeves, valves sold separately | Slide-on, before the valves | 15 mm; title also says 18 mm | 8.6 | about £11.90 | View offer |
 Blackspur Blackspur 15 mm sleeves, 8 pack | 8 sleeves, collars not included | Snap-on | 15 mm | 9.1 | about £3.26 | View offer | |
| Best value |  Aomaic Aomaic sleeves and collars, 10 of each | 10 sleeves and 10 collars | Snap-on | 15 mm | 8.4 | about £9.99 | View offer |
On this page
What a pipe cover is, and what it is not
A radiator pipe cover in this set is a finish piece. It clips or slides over a short tail so you see white plastic, anthracite, a chrome colour, or brushed brass. Pipe insulation is a foam tube that slows heat loss. A thin sleeve does not, and it does not change gas use.
One radiator usually shows two tails. Eight sleeves can dress four radiators and still leave every floor hole unfinished, because the rings were never in the bag. Blackspur's white sleeves are about 19.5 cm long at £3.26. Longer visible copper still leaves a gap.
Measure 15 mm before you trust the packet
B&Q treats 15 mm as the common UK size for taps and radiator circuits. Wednesbury puts 15 mm tube under BS EN 1057, which describes the tube, not the clip. Trade Radiators still names 8 mm, 10 mm and 22 mm. Measure the outside diameter on straight copper, not the floor hole and not the valve nut.
A 15 mm sleeve sits loose on 10 mm microbore and will not go onto 22 mm. FortWeal's ten black collars are stated for 16 mm at £5.49, and they are rings, not 200 mm sleeves. Cordial Mart states a 14-29 mm range on six black rings at £6.99. That can span a 15 mm tail and still leaves the copper on show.
Sleeve, collar, or both
The photograph often shows both parts when the bag holds one. Blackspur is £3.26 for eight white sleeves, and reviewers say the floor pieces in the picture are not in the bag. Aomaic at £9.99 puts ten 200 mm sleeves and ten collars together, stated 15 mm inside and 55 mm outside. Reviewers say the two whites do not match.
On Greened House the sleeve sits on the collar. ROHMERIQUE at £3.98 is four small rings, 4.3 from 73 reviews. FortWeal and Cordial Mart have no star line. Section 22 of the Consumer Rights Act 2015 gives 30 days to reject goods that are not as described.
Clip-on plastic or a sleeve that must go on first
Most plastic here clips onto a radiator that is already on the wall. Blackspur reviewers cut with scissors and snap the sleeve around a straight tail. Aomaic says the pipes can stay. A bent tail, or skirting hard behind the clip, still stops it.
UK Radiators is two 130 mm brushed antique brass sleeves at £11.90 that slide on before the valves. The bullet says 15 mm and the title also says 18 mm. They do not wrap a pipe. One review reports rust. If the valve is already tight, that pair is the wrong fit. Karrma at £3.99 prints PVC and brass against a plastic material field. See plastic or brass radiator pipe covers.
When to stop buying
A heating tail carries water. Gas installation pipework is a different service. Regulation 19 of the Gas Safety (Installation and Use) Regulations 1998 covers England, Wales and Scotland: pipework in a shaft, duct or void needs ventilation unless the pipe sits in a ventilated duct. A clip-on sleeve is not permission to box in a gas pipe. Northern Ireland's gas rules are not quoted here. If you cannot tell what the pipe carries, ask a Gas Safe registered engineer.
A weeping joint, or green damp copper, needs a plumber before a cover goes on. A 15 mm sleeve will not span mini-split lines, and opening those pipes needs an F-gas qualification. That boundary is on the mini split line set cover page.
Common questions
What size radiator pipe cover do I need?
Measure the outside diameter of the copper, not the floor hole and not the valve nut. A typical UK panel radiator is on 15 mm pipe. B&Q and Trade Radiators treat that as standard, and they still name 8 mm, 10 mm and 22 mm. A sleeve sold for 15 mm will not suit microbore or 22 mm.
Does the pack include the floor collars?
Only when the contents line says so, not when only the photograph shows rings. Blackspur's eight sleeves at £3.26 leave the hole bare. Aomaic includes ten collars with the sleeves. Each Greened House pack includes two collars. ROHMERIQUE, FortWeal and Cordial Mart are rings without a long sleeve.
Will a 15 mm sleeve fit microbore?
No. A 15 mm sleeve is made for 15 mm outside diameter. Microbore is commonly 8 mm or 10 mm, which Trade Radiators lists beside 15 mm and 22 mm. The sleeve sits loose, and forcing it does not change the diameter. This set has no microbore sleeve.
Can I clip a cover on after the radiator is fitted?
A split plastic sleeve can, if the heating is off, the pipe is cold, and the tail is straight. Blackspur reviewers snap the cover around pipe that is already in place. Aomaic's listing says the pipes need not be removed. The UK Radiators brass pair cannot. Those sleeves slide over the copper before the valves go on.
Are pipe covers the same as lagging?
No. Lagging slows heat loss. These sleeves and collars are decorative, and none is presented as a way to save gas or raise radiator output. A long cold run in a loft is an insulation job. A short copper tail you dislike the look of is a cover job.
Will the white sleeve match the white collar?
On Aomaic, reviewers say the collars look off-white or yellowish next to the sleeves, even though the pack includes ten of each at £9.99. Blackspur avoids the mismatch by leaving the collars out. Greened House reviewers talk about the sleeve sitting on the collar more than about two shades of white. Check a combined pack in daylight.
Related pages
Sources
Public UK sources and the amazon.co.uk listings compared on this page. Updated 23 October 2026.
- Gas Safety (Installation and Use) Regulations 1998, regulation 19 (retrieved 23 October 2026)
- Consumer Rights Act 2015, section 22 (retrieved 23 October 2026)
- Qualifications to work with F gas, GOV.UK (retrieved 23 October 2026)
- Refrigerant lines, Checkmark (retrieved 23 October 2026)
- Copper pipe sizes, B&Q (retrieved 23 October 2026)
- Are radiator valves universal?, Trade Radiators (retrieved 23 October 2026)
- Wednesbury size ranges (retrieved 23 October 2026)
- How to paint radiator pipes, Rawlins Paints (retrieved 23 October 2026)