Capricorn Non Return Valve Double Flap Fits Pipe Diameter: 110mm Dimensions: Length: 395mm, Width: 195mm, Height: 227mm MPN: 9-5020-110-00-03-11 Capricorn Non Return Valve Double Flap should be used for rainwater and grey water not containing faeces. Double flap made of plastic with a stainless steel sheet on the back to protect plastic against rodents, plus EPDM seal round flap. Made of high-quality ABS material, which guarantees thermal stability and chemical resistance to various substances in sewage sludge. Extensively tested for safety and conform to PN EN 13564 standard. Special design of the body minimizes the risk of solid wastes accumulating and blocking inside the valve. EN certified Back Flow (*Backwater) Non Return Valve effectively secure any rooms located on the lower floors against flooding caused by back flow of storm water and sewage via the drain systems. Back flow may be caused by intense rains, thaw or floods. Backwater valves are installed in horizontal sewage pipes before they exit a building or sewage drain outside the building before its connection to an external network. They are also installed in inspection chambers made of concrete or plastic. * "Backwater” means back flow of fluids due to a blockage in the sewer Back Flow valves also help preventing* access of rodents to houses through sewage pipes. Capricorn and Karmat does not give 100% guarantee of protection against access of rodents to houses. Equipped with an automatic closure mechanism, which automatically closes the device in case of reverse of sewage. Reliable and maintenance-free operation, Equipped with manual emergency closure mechanism, Effectively prevent unpleasant smells from getting into a building, in case of plumbing not being used for a longer period of time, Easy disassembly of the cover allows a valve to be checked twice a year for proper operation.