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4 inch Hi-Flow Flap Valves allow a rapid flow of rainwater through a down pipe or overflow pipe while being equipped with a flap that cannot be over rotated and left open. Once there is no demand of rainwater, the flap automatically closes to provide further mosquito protection and preventing birds from building a nest in your overflow pipe. Available in 3 inch or a 4 inch model, 4 inch High Flow Flap Valves (also known as a 4 inch Mozzie Stopper) can also be used for installing at the end of your SCH40 Inlet Pipe that dumps into your rainwater tank screen.Features: