3" High Flow Flap Valve

3 inch Hi-Flow Flap Valves allow a rapid flow of water through a double sealed, self cleaning valve that cannot be over rotated and left open. Available in 3 inch or a 4 inch model, 3 inch High Flow Flap Valves (also known as a Mozzie Stopper) are very popular for installing at the end of your SCH40 Overflow Pipe for mosquito & pest protection. 3 inch High Flow Flap Valves also prevent mosquitoes, pests or birds from traveling up your overflow pipe and finding their way into your rainwater tank, where they usually can't get out!