This monoblock valve is a hydraulic directional control valve. These valves are used to start and stop fluid flow into hydraulic cylinders or hydraulic motors.Operate hydraulic cylinders (Double-Acting or Single-Acting) Operate hydraulic motors ("D" Spool Required) Install rear remotes on a tractor. 2 Spool 21GPM Hydraulic Directional Control Valve For Tractor Loader w/Joystick. 2 Spool valve with compact design allows for installations in tight areas All spools are standard double acting with spring return to neutral position which are ideal for double acting cylinders Used for open center systems (Pump to Tank Flow) - closed center option available Anti-drop load checks on each spool Precision ground and hard chrome-plated spools assure a long life High-tensile strength cast iron monoblock construction SAE O-Ring ports ensure solid seal and prevent blockages Capable of Closed Center or Power Beyond (conversion plug required) Vertical or horizontal handle mount Adjustable Relief Valve Range: 1500 to 3625 PSI Used as motor or single-acting spool possible (#10 SAE port plug required). We will do everything we can to give you a satisfying solution. We do our best to resolve any issue. So please talk with us and we will not let you down. FEEDBACK IS VERY IMPORTANT TO US.