... OEM manufacturer experience Rubber Duckbill Valve,duckbill valve,slip on duckbill check valve The rubber Duck-bill check valve is all rubber reinforced. It ... , therefore it can be more competitive than other valves used for the same function such as gate valves. Some elastomers can ... according to the water pressure. 3, There is sound seal for back stop,no leakage,back flow prevention,the higher the ...