Fernco DN500 HDPE Wall Mounted Flap Valve inc Mounting Set

Flap Valves are one-way valves which are installed at the open end of a pipe line or culvert. Their purpose is to allow downstream water to exit the pipe via a one-way flap door, whilst preventing rising water levels outside of the pipe from entering the pipe and flowing back up the system and flooding the protected area. Both lightweight, corrosion resistant our Flap Valves act as Non-Return Valves and check valves for the prevention of reverse flows.