The Polypipe PolyPlumb Enhanced 22mm Plastic Pipe Stiffener (INCERT22) in black is built to reinforce and stabilise plastic pipe joints in push-fit plumbing systems. Designed with Polypipe’s In-Cert feedback mechanism, it gives assurance of full insertion to protect against leaks and ensure durability. Compatible with PolyPlumb fittings and polybutylene systems, it is suited for hot and cold water, heating circuits, and underfloor setups, meeting WRAS and BS 7291 standards.