90mm Flap Valve


Vented Flap Valves allow a flow of air over the surface of the water which improves your water quality and prevents vacuuming. The best kind of Flap Valves have a double seal, are self cleaning, and have  flaps that cannot be over-rotated and left open. 
  • Mosquito & vermin proof
  • Allows tank water to breathe and stay fresh
  • Prevents pests from entering the tank via the overflow
  • Automatically opens & shuts
When installing it is recommended that the Flap Valve is fitted with silicone and not glued.


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