Soil pipe double check valve has two independent protective non return valves which is beneficial during back flow because the pressure affecting the first flap is not immediately transferred to the other. Check valve comes in two different sizes 110mm or 160mm. - Diameter: 110mm or 160mm - Mounting: vertical - Karmat double flap backwater valves are equipped with an innovative chromium-nickel lever guard, which constitutes additional security - These are the only valves with two flaps equipped with two levers for manual closing available on the market. It enables fast evaluation of proper operation of both flaps. The easy change of both levers from opening position A to closing position B and back means that both flaps work properly in the valve and it is not necessary to carry out any additional maintenance operations - The possibility to check proper operation of both flaps is a great advantage of such a technical solution - Flaps are equipped with chromium - nickel protective guards securing the flap and gasket against rats and its sliding during sewage flow. It is a very important feature in places particularly exposed to rodents’ attempts to pass through. Their installation is advisable in regions prone to repetitive backflow of sewage - The guard protecting the flap as well as all mounting elements (screws, nuts and washers) are made from chromium-nickel - Equipped with a manual closure lever - Changing of the lever from OPEN position A to CLOSED position B causes a complete arrest of sewage backflow - Only the Highest quality polimer used in prodaction - The device’s interior with its smooth surface properly profiled, protects against sediment collection and grants complete and undisturbed sewage flow - Use of anti-flooding devices for rooms located on the lower floors is required by obligatory regulations to technical conditions that are be satisfied by building codes - Gaskets have been manufactured from a rubber of high resistance to atmospheric influences and to aging