New open box, has not been used. Max Operating Pressure: P = 3625 PSI, T = 725 PSI, A & B = 4350 PSI. A & B Work Ports: #10 SAE O-Ring (7/8-14) Thread. Inlet Port: #10 SAE O-Ring (7/8-14) Thread. Outlet Port: #12 SAE O-Ring (1-1/16-12) Thread. N Port: #12 (3/4 – 14) G Thread (British Pipe Thread Parallel). 3 – 5/16 Mounting Holes.