... Cast Steel Swing Check Valve: Swing Type Disc Check Valves, 16 Inch, 2500LB, Bolted, Pressure Seal Cover, WC6, WC9, C5 Cast ... B16.25. Test: API 598. Special: NACE MR-01-75. Pressure: 2500LB. Size Range: 16". Material Available: WCB, WCC, LCB, LCC, WC6 ...