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duckbill check valve water flood diffuser - The Rhinoflex duckbill check valves are an exceptionally reliable and a good, affordable replacement for flap-gate valves as well as other check valves. Be simple one-piece design and reinforced rubber construction get rid of the mechanical and metal components that rust and seize in conventional flap-gates. They're made to order, a proven way , non-return check valves, produced from a number of elastomeric rubbers, and built as reported by the application along with the line pressure and back pressure concerned. One can choose from all standard pipe sizes, and typical application is back flow prevention and downstream of a pump, at pump stations.