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Comparison : Item # CVDB-18-SN, CVDB Series Nylon Body Material Duckbill Check Valve
Item # CVDB-316-SN, CVDB Series Nylon Body Material Duckbill Check Valve
Item # CVDB-18-SPC, CVDB Series Polycarbonate Body Material Duckbill Check Valve
Item # CVDB-316-SPC, CVDB Series Polycarbonate Body Material Duckbill Check Valve
Item # CVDB-18-SK, CVDB Series Kynar Body Material Duckbill Check Valve