Ensure the safety of your water systems with the John Guest Double Check Valve. This push-fit acetal valve provides essential protection against the reversal of flow and back siphonage, safeguarding against Fluid Category 3 risks. Its low headloss design makes it ideal for a wide range of applications including potable liquids, foodstuffs, intermittent hot water (up to 50°C), and water treatment processes. Installation is fast and simple, requiring no tools, hot works, or sealing agents thanks to the instant push-fit connection and leak-tight seal. The unique collet locking design ensures a secure grip on the pipe without deforming it or restricting flow. Constructed from durable acetal copolymer with nitrile O-rings, this valve is corrosion-resistant and fully demountable for easy maintenance and improved system performance. Experience superior flow characteristics and a longer lifespan due to the absence of scale build-up. This valve is manufactured and assembled in the UK. Key Features: * Backflow prevention up to Fluid Category 3 * Spring-loaded internal check valve * Integral test ports * 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 * Superior flow characteristics * Suitable for potable water, foodstuffs, intermittent hot water, water treatment, and purification applications (not suitable for vacuum or air) * Compatible with LLDPE or soft metal pipe/tubing Product Summary: John Guest Double Check Valve, 15mm, metal construction, beige color, push-fit acetal, backflow prevention, fluid category 3, potable water, food grade, intermittent hot water, water treatment, no tools required.