The RPU300 is a reversible hydraulic steering pump for boats and works in conjunction with the NAC-3 or AC42 autopilot computer as part of an autopilot system. With 24 V motor and same flow rate (183cui/min), as standard RPU300. For Cylinder Displacement of 290-960 cm3. Requires 24 or 32 V DC input. (NAC-3 / AC42 required)