CHECK VALVE Features:Cast Steel Check Valve & Forged Steel Check ValveSize: 1/2″ – 48″Design: ANSI B16.34, API 6D, BS 1868Body Materials: Carbon Steels, Stainless Steel, Duplex SS, etc.Types: Swing Check, Dual Plate, Wafer Check, Lift/Piston CheckInspection & test: API 598