The John Guest Speedfit 12mm Check Valve is an essential component for plumbing systems requiring reliable backflow prevention. Designed for safety, this acetal single check valve protects against flow reversal and back siphonage, making it ideal for Fluid Category 2 applications. Its low headloss design ensures optimal performance for various uses, including potable liquids and foodstuffs. Installation is easy with the push-fit technology, allowing secure connections without tools. The collet locking mechanism holds the pipe firmly without deformation. Made from durable acetal copolymer and nitrile O-rings, this check valve is corrosion-resistant and fully demountable, enhancing system performance and minimizing downtime. Key features include durable construction, backflow prevention compliance, instant push-fit connection, tool-free installation, and compatibility with LLDPE or soft metal tubing. This push-fit acetal single check valve provides protection from the reversal of flow or back siphonage against Fluid Category 2 risks. The low headloss design is suitable for potable liquids, foodstuffs, intermittent hot water (up to 50 C max), water treatment and purification applications. It is perfect for Caravan, Campervan, Boat and Motorhomes use.