The Accusteer PUMPLA11-12 Linear Actuator is designed to interface an autopilot system with mechanical steering systems such as wire, cable or chain drives. This linear actuator consists of a hydraulic drive unit, steering cylinder, and interconnecting hoses. This unit is also available as the PUMPLA17-12 using a 1.75\" x 12\" RAM. Rudder Shaft to Tiller Bolt Distance): 6280 in. lbs. (710 Nm) Raymarine Equivalent Linear Drive: TYPE 1 (Recommended Maximum Boat Displacement = 22,000lbs (10,000kg)) Simrad Equivalent Linear Drive: HLD350 « less