John Guest Speedfit products blend push-fit and multi-seal technology for a reliable leak-proof connection. Simple to install and no tools are required when installing or demounting fittings, making it easy to manoeuvre in tight spaces or readjust joins. Speedfit's extensive choice of plastic, brass and chrome fittings, tap connectors, valves and flexi hoses gives you everything you need to complete the job in no time. By combining these products with plastic push-fit pipe, you can create a truly flexible plumbing and heating system. All products are accredited with the leading testing and approval organisations including WRAS and are suitable for use with plastic or copper pipe. The double check valve only allows water to flow through in one direction, therefore, preventing backflow of potential contaminants. To install, simply push the valve fully on to the pipe. Should the need arise to demount the connection push the collet towards the body of the fitting and pull the pipe to release. * Suitable for hot and cold water services, NOT suitable for central heating systems * BS EN 7291 parts 1, 2, 3 and S, WRAS approved * Secure and easy demounting without the need for a tool * 50 year guarantee * Minimum operating temperature - 20 degC * Maximum operating temperature - 65 degC * Maximum operating pressure at minimum temperature - 12 BAR * Maximum operating pressure at maximum temperature - 3 BAR JG Speedfit Double Check Valve 15mm in Grey Plastic John Guest push-fit acetal double check valve provides protection from the reversal of flow or back siphonage against Fluid Category 3 risks. he low headloss design, is suitable for potable liquids , foodstuffs, intermittent hot water (up to 50oC max and in accordance with The British Pub Association Code of Practice), water treatment and purification applications. Fast and simple to install, John Guest valves create an instant push-fit connection and leak tight seal without the need for tools, hot works or sealing agents. The unique collet locking design firmly and securely holds the pipe in place without deforming the pipe or restricting flow. John Guest push-fit valves are corrosion resistant and fully demountable, improving system performance and reducing system downtime during maintenance. All John Guest fittings are manufactured and assembled in the UK.Durable acetal copolymer material and nitrile O-ringsBackflow prevention up to Fluid Category 3Spring loaded internal check valveIntegral test ports Instant push-fit connection and leak tight sealConnect, disconnect and reconnect in seconds without toolsNo scale build up improves performance and equipment lifespanSuperior flow characteristicsSuitable 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.