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Duckbill Check Valves are manufactured similarly to the Slip-on Duckbill Check Valve, with the addition of an integral elastomeric flange. The Flanged Rubber Duckbill Check Valve is designed to be efficient, quiet and tough. It requires no external power sources, thereby reducing operating costs. The simple design means there are no moving mechanical parts to break down or jam, reducing maintenance costs.This type of valve is ideally suited to marine outfall diffusers.