SVR two flap anti-flood valves have a non-return flap, which operates automatically.
The two flap anti-flood valves have a double protection against backflow from surcharging sewers, rodents or vermin. In order to keep a protection against flooding one flap will remain effective should the other flap fail or be blocked.
The SVR two flap anti-flood valves will help you avoid unpleasant and costly damage caused by the revocation of sewage into the building.
NRV5020/110
NRV5020/125
NRV5020/160, NRV5020/200