Soil pipe non return flap valves protecting lower household levels against flooding caused by backward flow of storm water and sewage. Soil pipe check valves are fully self-activating. Flap valves effectively protect plumbing systems from rats entering the buildings. Flap valves are installed at the end of sanitary sewage pipes entering collection wells, cesspits or drainage pipes leading storm water to ditches or rivers. Specifications: - Size: 110mm, 160mm, 200mm or 72-100mm (universal); - High quality polypropylene and stainless steel ending; - Sun light/high temperature resistance; - Immunity to aggressive chemical compounds; - Installed at the end of sanitary sewage pipes leading storm water to ditches or rivers; - Prevents against rodents entering building interiors through the sewage and other sanitary systems; - Secure the lower floors against flooding caused by back flow of storm water and sewage; - High quality PVC Plastic and stainless steel ending, sun light/high temperature resistance.