Push Fit Soil Pipes
Push fit soil pipe seals with a ring rather than solvent, so a stack can be assembled in place and taken apart again, which helps in a loft conversion or where access is tight. Soil pipes and fittings cover 110mm and 160mm at 3m and 4m. Where a stack is boxed in for good, solvent weld soil pipe gives a rigid joint instead.
Free delivery on orders over £150 inc VAT.
22 UK Branches
Choosing Push Fit Soil Pipes
Frequently Asked Questions
110mm is the standard for a house stack taking a WC. 160mm is for a stack serving several flats or a commercial building where 110mm would be undersized. Waste-only runs from a basin, bath or sink use 32mm, 40mm or 50mm depending on the appliance, and join the stack through a boss.
Push fit seals on a ring, so a run can be dismantled and reused and there is no curing time — useful for a repair, or anywhere access stays open. Solvent weld is cemented rigid at every joint, which suits a stack that will be boxed in or a run sealed behind plasterboard, where a creeping seal is a real problem.
Yes — without air entering the stack, a discharging WC can siphon the water seal out of nearby traps and let drain smells into the room. Traditionally the stack runs open to above roof level. An air admittance valve is the alternative where taking the stack through the roof is not practical, but at least one stack on the system should stay open.
32mm is for a hand basin. 40mm covers a sink, bath, shower, washing machine and dishwasher — anything discharging a larger volume. If in doubt, 40mm. Running a basin in 40mm is not a problem; running a bath in 32mm is, and it shows up as slow draining and gurgling.