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110 mm underground drainage pipe: what to check before you pay

Updated: October 2026

You are about to pay for a 110 mm underground drainage pipe, and the title may only be a solvent-weld offcut. In England a domestic foul drain is 100 mm nominal in Approved Document H, and the plastic sold for that job is 110 mm outside diameter. The joint and the standard decide whether that length can go in the ground. This checklist covers the ring seal and what a normal 3 m length costs at a UK merchant. The [underground drainage pipe comparison](/hub/rods-and-pipes/underground-drainage-pipe) keeps three amazon.co.uk listings, and none of them states BS EN 1401. Figures are from 16 October 2026. The Products Compared editorial team did not laboratory-test these pipes.

You are about to pay for a 110 mm underground drainage pipe, and the title may only be a solvent-weld offcut.

Our top picks

GIONAR GIONAR catch-basin and downspout kit

Best overall

GIONAR GIONAR catch-basin and downspout kit
6.2/10about £20.99
View offer
eco-filtration eco-filtration 110 mm solvent-weld pipe, 1 m

Alternative

eco-filtration eco-filtration 110 mm solvent-weld pipe, 1 m
4.6/10about £19.99
View offer
lcyen lcyen flexible downpipe, 21 to 60 inches

Best value

lcyen lcyen flexible downpipe, 21 to 60 inches
4.0/10about £12.99
View offer
On this page
  1. 1.What 110 mm means on a UK drain
  2. 2.The joint and the standard
  3. 3.What a 3 m pipe costs, and what these three listings are

What 110 mm means on a UK drain

A 110 mm underground drainage pipe is sized on the outside. Kalsi’s sheet, dated February 2026, gives one maker’s figures: about 103.6 mm inside, an SN4 wall of about 3.2 mm, and lengths of 3 m and 6 m with a ring seal. Approved Document H talks about 100 mm nominal bore. Paragraph 2.33 puts a WC, or trade effluent, on at least that size. Colour does not decide the duty. Terracotta is usual and grey is common, but a black pipe can be 110 mm and still be solvent-weld waste. Measure the pipe you uncover before you order. A matching diameter can still be soil pipe, which is why the joint comes next.

The joint and the standard

Specify PVC-U to BS EN 1401, with the application code UD that Table 7 says is normally used underground, or structured-wall pipe to BS EN 13476. The joint is a rubber ring. Paragraph 2.40 wants flexible joints below ground so the run can settle. Solvent cement is rigid. It can be right for waste pipe above ground. It is a poor specification for a foul drain in a trench. Read the barrel, not only the web title. You want the standard, the size, and a ring-seal socket or a plain end sold for a ring-seal coupling. The eco-filtration pipe in this comparison, B0GFX8F17F, is the miss: 110 mm, 1 m, £19.99, and the bullets say to use solvent-weld adhesive. No adhesive is in the box. Under a drive, or on a public sewer, building control and the undertaker are the stop. Paragraph 2.5 asks for at least three weeks’ notice before a public connection.
GIONAR GIONAR catch-basin and downspout kit

Testsieger

GIONAR GIONAR catch-basin and downspout kit
6.2/10about £20.99
View offer

What a 3 m pipe costs, and what these three listings are

On 16 October 2026 a FloPlast 110 mm terracotta pipe of 3 m was £16 at Wickes, £15.19 including VAT at Screwfix, and £16.99 at Toolstation. That is about £5 to £6 a metre. The eco-filtration pipe is £19.99 for 1 m of solvent weld, so the joint and the price per metre both miss that band. The lcyen extender, B0DDKX2P23, is £12.99, with a burial bullet and no standard. A UK review on 15 March 2026 said the diameter was more like 86 mm than the 68 mm in the technical block, and the buyer returned it. The GIONAR kit, B0BTGNVMMQ, is £20.99, rated 4.4 from 134, with a pipe stated from 16.14 inches to 5.1 feet and no 110 mm socket. None of the three states BS EN 1401. For a foul run from a WC, leave all three and buy a 110 mm ring-seal pipe in 3 m or 6 m, plus couplings. A qualifying Amazon purchase can earn us a commission at no extra cost to you.

Common questions

Is 110 mm the same as 100 mm?
They are the same domestic size. Approved Document H uses 100 mm nominal for a foul drain that serves a WC. The plastic is 110 mm outside, still called 4 inch in older speech. A 160 mm pipe is the next size up. A single house does not need it merely to sound safer, and 150 mm has its own fall row.
What should be printed on an underground PVC pipe?
Look for BS EN 1401 or BS EN 13476, the size, and the code UD. A ring-seal socket, or a plain end for a ring-seal coupling, belongs with that print. Solvent weld, or a mains pressure rating, marks a different product even when the millimetres match. Terracotta colour alone is not the print.
Why is solvent weld the wrong joint in the ground?
Solvent cement makes a rigid joint. Paragraph 2.40 wants flexible joints so the pipe can move as the trench settles. A rubber ring does that. You can still use solvent-weld waste pipe above ground or on a pond, where the listing is honest about adhesive. Burying it as a house drain skips the joint the guidance asks for.
How much is a normal 3 m length in the UK?
On 16 October 2026 a FloPlast 110 mm pipe of 3 m was £16 at Wickes, £15.19 including VAT at Screwfix, and £16.99 at Toolstation, about £5 to £6 a metre before fittings. The £19.99 Amazon length in this set is 1 m and solvent weld, so it sits outside that band and outside that joint.
Are the Amazon listings in this comparison that pipe?
They are not. B0GFX8F17F is a 1 m solvent-weld waste pipe, B0DDKX2P23 is a flexible gutter extender, and B0BTGNVMMQ is a catch-basin kit. None states BS EN 1401 or a ring seal for burial. Star ratings do not stand in for the standard on a merchant pipe.
When do I stop and call building control?
Stop when the trench goes under a drive or into the highway, when you cannot tell whether the pipe is a public sewer, or when an extension sits on a mapped sewer. A public connection wants at least three weeks’ notice. A short repair in a garden, on a pipe you can identify, is the job this checklist is for. The 2011 transfer did not make every garden pipe a public sewer.

Related pages

110 mm underground drainage pipe fall

Clay or plastic underground pipe

How to lay underground drainage pipe

Underground drainage pipe kits

Best underground drainage pipe among this Amazon set

Sources

Sources from the research digest, last checked on 16 October 2026.

  1. Approved Document H, 2015 PDF (retrieved 16 October 2026)
  2. GOV.UK Approved Document H (retrieved 16 October 2026)
  3. FloPlast 110 mm system (retrieved 16 October 2026)
  4. Kalsi Plastics: underground 110 mm specification (retrieved 16 October 2026)
  5. Wickes FloPlast 3 m pipe (retrieved 16 October 2026)
  6. Screwfix 110 mm underground category (retrieved 16 October 2026)
  7. Toolstation 110 mm underground drainage (retrieved 16 October 2026)
  8. Ofwat private sewer transfer (retrieved 16 October 2026)
  9. CPDA structural design (retrieved 16 October 2026)