The Simrad RPU160 Drive Unit is a reversible hydraulic steering pump for boats up to 50' in length. The pump works in conjunction with the Simrad AC42 autopilot computer as part of an autopilot system. Specifically designed for vessels with a cylinder displacement of 9.8 to 33.5 cu. in. Moderate flow rate: 1.6L per minute. 12V DC power. 160-550cc engines.