Vevor 1 Spool 21 Gpm Hydraulic Directional Control Valve Bspp Port W/joystick Hydraulic Loader Valve Neutral Spring-Center Inner Check/Relief Valve Durable Construction Compact Handle Design Wide Application Flow Rating: 21gpm,Relief Valve: Adjustable,Model: 121GPM3600,Spool Count: 1-Spool,Valve Operation: Manual,P port: 1/2' BSPP,T, N port: 3/4' BSPP,Center system: Open,A, B ports: 1/2' BSPP,Max operating pressure: 3600 PSI