Rubber Duckbill Valve 1,ISO9001 and ISO14001 2,DN50~3000mm 3,Material:rubber,steel 4,12 years OEM manafacturer experience Rubber Duckbill Valve,flange duckbill valve,rubber check valve 1: Product Introduction 1: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. 2:Based on analysis and calculation of ...