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  • Flap Valve for Land Drains and other unperforated corrugated pipes.
  • Flap Valve for Land Drains slips onto 72mm to 100mm corrugated drainage pipes.
  • Installation example of the Land Drain Flap Valve.
  • How the Flap Valves work (note Land Drain Non-return Valve colour is Yellow).
  • Land Drain Outfall Valve Dimensions.

Flap Valve - Anti flood Non Return Valve, Land Drain


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Product Description

72/100mm Land Drainage Flap Valve/Rodent Barrier

Non Return Valve with universal connection system can be installed at the end of land drains and other unperforated corrugated pipes, from 72mm to 100mm diameter.

What is a Drainage Flap Valve?

Drainage Flap Valves are innovative devices used to prevent flooding caused by the back flow of storm water. Backflow can be caused by intense rain, thaw or floods. The valves prevent backflow and silting due to the increasing water levels above the drainage level.

Where the Flap Valve has a metal Faceplates (like these), they are also an effective rat barrier to your land drainage system. The metal stops the rodents from chewing through the flap facepate of the non return valve and protects your drainage system from blockage due to rodents building their nests in the pipes.

Flap Valves are installed on a pipe and allow water to flow through the pipe as usual, but prevent anything from flowing back in, like flood water, rats or debris. The pressure of the water flowing through the pipe will open the valve, they automatically close when there is nothing flowing through the pipe.

Where can these Flap Valves be installed?

These flap valves are designed to be installed at the end of land drains and other unperforated corrugated drainage pipes leading storm water to soakaways or rivers. They are sometimes referred to as Outfall Flap Valves.

Comes with Universal Coupling which fits 72mm to 100mm pipes.

Easy to install. The Non-Return Valve simply slips on to the end of the pipe.


Unfortunately we cannot accept returns for this product when it has been fitted. If you are unsure as to whether this is the correct product for your system, please contact us before purchasing. We will happily offer free, impartial advice.

Technical Information

This flap valve is equipped with a chromium-nickel cover (A) protecting the flap and gasket. Additionally a chromium-nickel cover of the lever (B) has been designed into the Non-Return Valve to protect against rodents, atmospheric and the environmental conditions (eg. river flow). Flap valves have a Universal Coupling system built in which ensures a tight fit of the valve to the pipe and effectively keeping the non return valve in place.

  • Suitable for unperforated corrugated pipes
  • Fits 72mm to 100mm Pipes
  • Fits over the outside of the pipe
  • Installed at the end of the pipe
  • Operation fully self-activating
  • Plastic body: high quality polypropylene with increased UV resistance. The material is harmless to the environment and can withstand temperatures up to 95°C as well as resist aggressive chemicals.
  • Stainless chromium-nickel stainless steel Faceplate
  • Conforms to EN-13564-1:2004

Other Versions

  • Flap Valves for 110mm and 160mm pipes,
  • Inline Backflow Valves Valves for 50mm waste pipes,
  • 110mm and 160mm Inline Backflow Valves for Horizontal pipes,
  • 110mm and 160mm Inline Backflow Valves for Vertical Pipes.

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