Rubber Duckbill Valve 1,ISO9001 and ISO14001 2,DN25mm~5000mm 3,Material:rubber,steel 4,12 years OEM manafacturer experience Rubber Duckbill Valve,flexible check valve,rubber check valve1: Product Introduction • Rubber check valve is made of rubber ,it looks like a duckbill and is a new draining valve with functions of forward inflow and reverse back stop.• Based on analysis and calculation of ...