This product is made to be installed with 56mm (known as 2 inch solvent weld) and 43mm (known as 1 1/2 inch solvent weld) pipe or fittings. If your pipe or existing fittings measure 50mm and 40mm, or has PP printed on it, then this product is not compatible and you will require 50mm and 40mm pushfit or compression fittings This listing is for a Pack of 1. Please note that it is not the correct size to be used in a strap boss Solvent weld reducer designed to fit into a larger solvent weld fitting and then accept a smaller solvent weld pipe Solvent weld fittings are secured using solvent weld cement for a permanent and strong installation This is for waste water use and not rainwater drainpipe use which is a different product, Weight: 0.0440924524 Pounds, Manufacturer: Floplast