Hydraulic Power UnitA compact powerhouse that creates hydraulic pressure to lower and raise the trim tabs. It employs two solenoid valves to direct the flow of fluid to the actuators. The solenoid valves lock tightly to secure the tabs in place. Strength to lower and hold even the largest tabs in place. Lexan cover protects electrohydraulic unit from occasional wash down and translucent reservoir allows fluid check at a glance.Measures 4" x 7 1/2" x 5 1/2". Uses automatic transmission fluid. Includes pump, solenoid valves, reservoir and cover.