The R2345-O Autopilot Cylinder Unloader valve is a line mounted valve used to bypass the hydraulic steering cylinder so the boat can be steered manually. It is operated by a 12 watt solenoid and is available in 12 and 24 V.d.c. variants. It can be used in systems up to 72 bar and can be used with balanced cylinders or by connecting the additional port to a reservoir for unbalanced cylinders.