Key Points: - 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. Operate hydraulic cylinders (Double-Acting or Single-Acting) - Operate hydraulic motors ("D" Spool Required) - Install rear remotes on a tractor Key Features.