Traps

Where to use which trap?

Appliance	Recommended product	Preference
Vanity/wash basin	32mm bottle trap, WBT3W 32mm P-trap, WPT3W 32mm Slimline pedestal trap, KXT32XR 32mm S-trap, WST3W	Depending upon position of waste in relation to basin outlet.
Sink	40mm P-trap, WPT4W 40mm S-trap, WST4W	Bottle traps are generally not recommended for kitchen sinks due to likelihood of blockage.
Bath	40mm low level P-trap with access, WBP42W 40mm P-trap with access, WPL42W 40mm low level bath trap, WSB4W*	Dependant on space between floor and bath. WSB4W is not recommended where waste pipe is connected to a soil stack.
Shower	40mm low level P-trap with access, WBP42W 40mm shallow shower trap, KXT4XR* 40mm low level bath trap, WSB4W*	Shower trap has a removable waste for cleaning.
Sink/bath overflow fittings	Flexible overflow pipe, WOP1W & WOP2W Bath overflow outlet, WBO1W

* These items have a 20mm water seal depth (conventional traps have a 50mm –75mm water seal depth). It is recommended that their use is restricted to ground floor baths and showers that discharge to an external trapped gully. They should not be fitted to appliances where the waste pipe is connected to a soil stack.