Waste Traps
A sink waste trap holds the water seal that stops drain smells rising into a kitchen or bathroom. P traps, bottle traps and shallow bath traps cover 32mm and 40mm waste in white or chrome, with telescopic versions for a tight cupboard. Connects to push fit waste.
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Choosing Waste Traps
Frequently Asked Questions
A P trap where the waste runs horizontally into the wall, a bottle trap where it drops and space behind the basin is tight, and a shallow trap under a bath or shower tray where there is very little height. Telescopic versions take up the difference in a cupboard where the pipe centre does not line up.
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.
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.
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.