Ensure reliable and leak-free plumbing connections with the John Guest Speedfit Superseal Pipe Insert, designed specifically for 15mm Speedfit pipes. Each insert in this pack of 100 features dual O-Rings that enhance sealing security beyond standard inserts. The first O-Ring effectively prevents water from escaping between the pipe wall and the insert, while the second O-Ring forms a tight seal within the push-fit fitting. This innovative design creates a multi-seal system when combined with Speedfit push-fit fittings, further enhancing the integrity of your plumbing setup. Ideal for both hot and cold water systems as well as central heating applications, these pipe inserts maintain the structural integrity of connections and provide added rigidity when side loads are applied. Trust the John Guest Speedfit Superseal Pipe Inserts for all your plumbing needs, ensuring durability and performance in every installation.