Swing check valve Sorts: Butt and socket weld connection, thread connection, Y type, T type Material: Staniless steel 304, 316, CF8, CF8M, WCB Seat: PTFE Size: 1/4" to 4" Working pressure: PN16 (200psi for W. O. G. ) Thread: NPT. BSPT. BSP. DIN2999. ISO228/1 Working pressure: PN16, 200 psi Working temperature: -50 to +230 centigrade