The Simrad RPU300 Drive Unit is a reversible hydraulic steering pump for boats up to 70' in length. The pump works in conjunction with the NAC-3/AC42 autopilot computer as part of an autopilot system. Specifically designed for vessels with a cylinder displacement of 23 to 36 cu. in. High flow rate: 3.0L per minute. 12V DC power. 290-960cc engines.