Spring Check Valve, Material of Construction T316L Stainless Steel, Tube Size 2 1/2 in, Connection Clamp, Surface Finish 20 RA ID, Overall Length 5 3/8 in, Max. Pressure 145 psi, Cracking Pressure 1 to 3 psi, Temp. Range 0 to 200 Degrees F, Mounting Position Vertical, Seat Material Viton, Spring Material T316 Stainless Steel, Standards Class VI Seats, Certification 3A