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The Polypipe grey flexible barrier plumbing and heating pipe comes in 15mm, 22mm, or 28mm diameters. It is perfect for PolyPlumb PolySure and Underfloor Heating systems. Made from polybutylene, these pipes are highly flexible and efficient. Polybutylene is great for domestic hot and cold water plumbing and heating systems. This material provides outstanding durability and long-term performance, making it ideal for modern construction projects. Its natural flexibility allows the pipe to bend into tight spaces easily. The pipes are available in 3-meter lengths. This design has been reliable, well tried, and tested for 30 years.. Polypipe Barrier Pipe - 22mm x 3m Plastic Polybutylene PB322B