The Polypipe PolyPlumb Enhanced 28mm Plastic Pipe Stiffener (INCERT28) in black is designed to reinforce and stabilise plastic pipes in push-fit plumbing systems. Featuring Polypipe’s patented In-Cert feedback, it provides tactile confirmation of full insertion for reliable joint integrity. Ideal for use with PolyPlumb fittings and polybutylene pipes, it is suitable for hot and cold water, heating, and underfloor heating applications. WRAS and BS 7291 approved, this stiffener delivers long-lasting performance and professional results for domestic and commercial installations.