Common Uses: Operate hydraulic cylinders (Double-Acting or Single-Acting) Operate hydraulic motors ("D" Spool Required) Install rear remotes on a tractor Monoblock Hydraulic Directional Control Valve w/ 2 Joysticks, 6 Spool, 11 GPM 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.