* 75mm water seal * Universal compression outlet suits all plastic, copper and lead pipe * Anti-syphon valve neutralises negative syphonic pressure and eliminates gurgling * Manufactured in polypropylene * Conforms to BS EN 274-1:2002 McAlpine Anti-Syphon 'P' Trap 1 1/2" SC10V in White Plastic. Mc Alpine anti-vac trap is an anti-syphon 'P' Trap with a tubular swivel and a universal outlet. It is used to eliminate water and the accompanying gas as waste. Polypropylene based, these are used with a variety of bath and plumbing supplies. Part of the drainage system, this swivel trap from McAlpine is suitable for all types of pipe.