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Polypipe fittings offer versatile pipe inserts in various dimensions for different applications and needs. Choose from plastic or metal inserts to suit your requirements. Polypipe Plastic Pipe Inserts (15mm) are small components designed to fit into the ends of 15mm plastic pipes to provide extra support and maintain the pipe’s shape when using compression or push-fit fittings. They strengthen the pipe, ensuring a secure, leak-proof connection by preventing it from collapsing or deforming under pressure. Commonly used in plumbing and heating systems, these inserts improve the strength and reliability of pipe connections.. Polypipe Plastic Pipe Insert 15mm - Pack of 50 PP6415