9 in Flow Control Valve,1/2 In,0 to 16 GPM.) 4. Pressure - Hydraulic Valves 3,000 psi, Inlet Port Size - Hydraulic Valves 1/2 in NPT, Outlet Port Size - Hydraulic Valves 1/2 in NPT, Body Material - Hydraulic Valves Cast Iron, Adjustable Relief Valve Yes, Height (In.6 in, Width (In.