This product is made to be installed with 43mm (known as 1 1/2 inch solvent weld) pipe or fittings. If your pipe or existing fittings measure 40mm, or has PP printed on it, then this product is not compatible and you will require 40mm pushfit or compression fittings. This listing is for a Pack of 1 Solvent weld waste pipe coupling designed to join two waste pipes. 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.