McAlpine 1¼" A10V Anti-Syphon Bottle Trap With Multifit Outlet Product Features Multifit compression outlet suits all plastic, copper & lead pipe Manufactured in polypropylene Anti-Syphon Valve neutralises negative syphonic pressure & eliminates gurgling Conforms to BS EN 274-1:2002 Available in 1¼" & 1½" Product Specification Size: 1¼" Size - 1 1/4" Water Seal - 75mm Anti Syphon