Raymarine Type 3 Autopilot Hydraulic Reversing Pump - 2.9L / 12VDC

If your system is hydraulic you'll need to find out the size (in cc) of the hydraulic cylinder ram(s) mounted to the rudder or inboard engined boats, or to the drive unit on outboard engined boats.

Your steering system documentation will have this information. Drive Type: Type 3 12V Ram Capacity: 350cc-500cc (21in³ - 30.5in³) Maximum Stall Pressure at 12V: 80bar (1160 psi) Peak Flow Rate (No Load) 2900cc/min (175in³/min) ACU used ACU-400"