General description Always use a JG Speedfit superseal pipe insert when connecting Speedfit pipe to a Speedfit push-fit fitting. These inserts play a vital role in providing extra support to pipework, ensuring that the ends of the pipe are kept nice and round, and minimizing any loss of shape that can occur when cutting. The JG Speedfit superseal pipe insert contains dual o-rings to provide even greater sealing security than a standard insert. Technical specifications Size: 22mm Pack quantity: 25 Material: Plastic Usage Suitable for hot and cold water and central heating systems Designed for use with Speedfit pipes and fittings only Other information The first o-ring is on the stem that is pushed into the pipe to prevent water from inside the pipe passing between the inside of the pipe wall and the outside surface of the insert. The second o-ring sits on the end of the insert and seals inside the push-fit fitting, creating a seal between the main pipe and push-fit fitting. When