Cast Iron Dual Plate Check Valve API 594 Pressure Rating : PN-16 Material : Cast Iron / Ductile Iron Description : Spring Loaded, Retainerless Design Disc : Ductile Iron / SS 304 / SS 316 Spring : SS 316 Body Seat : Resilient (BUNA-N / EPDM) Ends : Wafer Type, Lugged, Flanged Item Code : CI000085 Size : 50mm Notes : Available Valve Size PN-16 50mm to 900mm PN-25 50mm to 900mm PN-125 50mm to 900mm