McAlpine Anti-Syphon 'P' Trap with a 75mm water seal and a universal compression outlet that suits all plastic, copper, and lead pipe. The anti-syphon valve neutralises negative syphonic pressure and eliminates gurgling. Manufactured in polypropylene, it conforms to BS EN 274-1:2002. This tubular swivel anti-syphon 'P' Trap comes with a 10-year guarantee. It is crafted for 1 1/4" pipes and ensures a secure seal with its Multifit connection against the fitting wall.