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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.
Prevent flooding problems with a good quality NRV.
Ideal for situations, like mine, where water drainage from roofs goes into a stream via underground pipes and it is necessary to stop return flow in flood conditions. Already had 2 installed and now putting further 2 in place.