Flap Valve Vent Screen | Keep Mosquitoes Out | Rain Harvesting
90mm Male
90mm Female (New)
150mm (New)

Flap Valve Vent Screen

Flap Valves
Stop mosquitoes from entering your tank outlets without interrupting the flow of fast-moving water with this “breathable” flap valve.
Size 50mm TAFV01
Size 90mm Male TAFV02
Size 90mm Female (New) TAFV12
Size 100mm TAFV04
Size 150mm (New) TAFV15
  • 50mm
  • 90mm Male
  • 90mm Female (New)
  • 100mm
  • 150mm (New)
Flapvalve Ksp 1

Keep your tank “breathing” safely

Keeping your tank ventilated helps to protect your rainwater quality – but only if you can also keep mosquitoes out. The Flap Valve Vent Screen lets you can do both, safely and effectively. It also prevents a vacuum forming when large quantities of water are quickly drawn from your tank.

Mosquito Macro

Mosquito-proof your tank outlets

Flap Valve Vent Screen protects your rainwater quality. The hinged “flap” or “door” features a mosquito-proof 955 micron stainless steel screen that stops mosquitoes and other pests from getting into your tank via your horizontal outlet pipes. It self-closes to seal off your tank outlets whenever water is not passing through.

Flapvalve Ksp 3

Let overflowing water out

The Flap Valve Vent Screen’s responsive hinged flap automatically opens to allow overflowing water to pass out of your tank at a high flow rate.

Keep mosquitos out of your charged / wet rainwater line, not just overflows

Anywhere there is a wet or charged rainwater line which is used to fill a rainwater tank, a flap valve should be used on the outlet side before the line empties into the tank. This is important to ensure mosquitos cannot enter any portion of the rainwater system.

Secure your System with Rain Harvesting Flap Valves. Securing a Flap Valve to end of your tank and downpipe outlets ensure pests and insect can’t enter your Rain Harvesting system and harm your rainwater.

Learn more about the 4 pillars of designing a Rain Harvesting system. 

  • Specifications

  • Installation

    Tank overflow outlet or tank overflow outlet pipe

    1. Select an installation point for your Flap Valve. It can be attached directly to your tank overflow outlet, or to your horizontal tank overflow outlet pipe.
    2. Orient your Flap Valve so the hinge is at the top, then secure directly to your chosen installation point with silicone or solvent weld glue.


    Non-plumbed tank inlet pipe

    1. Orient your Flap Valve so the hinge is at the top, then secure directly to your non-plumbed tank inlet pipe with silicone or solvent weld glue.
  • Maintenance

    Your Flap Valve is self-closing and largely self-cleaning, so it requires little to no maintenance. If maintenance is required, simply hose or brush off the flap or mosquito-proof stainless steel vented screen.

  • What's in the box?
    • Flap Valve Vent Screen
  • Tools you might need
    • Silicone (optional)
    • Solvent weld Glue (optional)
  • Product FAQs

    What are the benefits of a vented flap valve?

    Vented and non-vented flap valves provide a self-cleaning insect-proof and vermin-proof barrier at the end of your pipework. However, vented flap valves also allow fresh air to circulate freely through your pipework and tank, a benefit not available with non-vented flap valves.

    What’s the difference between a flap valve and a frog flap?

    “Flap valve” and “frog flap” are interchangeable names for the same product. Both are designed to keep frogs and smaller pests such as mosquitoes out of your pipework and tank.

    Do I need to glue this fitting?

    We recommend gluing flap valves to your pipes. Although a flap valve is an end of line component and is not subjected to pressure, it is important that all mosquito-proof barriers are secure.

  • Gallery

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