+GF+ PVC-U Cone Check Valve Sockets 561 EPDM +GF+ PVC-U Cone Check Valve Sockets 561 FPM +GF+ PVC-U Cone Check Valve Thd Sockets 561 EPDM R +GF+ PVC-U Cone Check Valve Thd Sockets 561 FPM Rp +GF+ PVC-U Cone Check Valve Spigots 561 EPDM +GF+ PVC-U Cone Check Valve Spigots 561 FPM +GF+ PVC-U Cone Check Valve Fixed Flanges 561 EPDM +GF+ PVC-U Cone Check Valve Fixed Flanges 561 FPM