Rain Harvesting 100mm Plain Flap Valve Pest Proof Overflow Pipe Fitting | TAFV03

The end of an overflow pipe or charged line is one of the most overlooked entry points for pests in a rainwater harvesting system. Without a proper seal at the outlet, mosquitoes, frogs, and other small creatures can find their way into your pipework and ultimately into your tank — a problem that is far easier to prevent than it is to fix after the fact. The Rain Harvesting 100mm Plain Flap Valve is purpose-built to close off this vulnerability permanently, providing a reliable and automatic barrier that keeps pests out of your system around the clock.

The flap valve operates on a beautifully simple principle that requires no manual intervention whatsoever. Whenever water flows through the pipe — whether during a heavy downpour or a routine overflow event — the flap automatically opens to allow unrestricted passage of water out through the outlet. There is no restriction to flow, no back pressure build-up, and no risk of the valve failing to open even during high rainfall events when overflow volumes can be significant. The moment water flow ceases, the flap closes securely under its own weight, instantly restoring the pest-proof seal without any action required from the homeowner.

The foolproof design of the TAFV03 goes a step further by ensuring the flap cannot over-rotate or become stuck in an open position. This is a critical design feature that lesser fittings often overlook — a flap that can get stuck open provides no protection at all. With the Rain Harvesting Flap Valve, you can have complete confidence that the fitting is either flowing freely when it needs to or fully closed when it should be, with no in-between states that could compromise your system’s pest protection. The durable grey UPVC construction ensures the valve holds up reliably in outdoor conditions over the long term.

For Australian homeowners managing rainwater tanks, stormwater systems, or any charged line that terminates at an outdoor outlet, the Rain Harvesting 100mm Plain Flap Valve is an essential and inexpensive layer of protection. It installs simply at the pipe outlet, operates entirely automatically, and delivers consistent pest exclusion performance without requiring any maintenance or ongoing attention.

Model Number: TAFV03

Please Note: This flap valve is intended for outdoor installation at the end of overflow pipes or charged lines. Confirm compatibility with your existing 100mm pipework prior to installation.