1. K

    Help connecting 40mm anti-syphon p trap to 40mm sink waste?

    I've just got a 40mm anti syphon p trap to replace a normal sink u-bend (to fix gurgling sink issues). The upright part that should connect to the sink waste is 40mm, but as the sink waste is also 40mm there's no way for them to slot together. At the other end, the p trap is large enough to...