Grooved End Connection Check Valve Grooved End Swing Check Valve TKGD Series Ductile Iron Grooved Swing Check Valve Size: 2″ Thru. 4″ Pressure: 300 PSI WP Body Material: ASTM A 395 Ductile Iron Disk: 304 SS Seat and Seal: Viton Port: Full Open Grooved Ends. Top Coupling NACE MR-0175 Compliance