The John Guest 12mm Pipe Insert is suitable for potable domestic and commercial water applications including softening, conditioning, filtering, reverse osmosis, cleaning, sanitising, and more. Used for both hot or cold pipes, the John Guest 12mm pipe Insert prevents joints from leaking and keeps plumbed systems rigid to increase longevity. Features Instant push-fit connection and leak tight seal Connect, disconnect and reconnect in seconds without tools No scale build up improves performance and equipment lifespan Non-toxic food grade material Superior flow characteristics Suitable for soft metal or plastic tubes John Guest fittings are commonly used with water dispensers and coolers, hot brewing appliances, beverage vending machines, ice makers and beer dispensers, ensuring fresh, great tasting drinks every time.