Bennett Marine DAHPU Dual Acting Hydraulic Power Unit, 12V. Creates hydraulic pressure to lower and raise the trim tabs Employs two solenoid valves to direct the flow of fluid to the actuators 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 Translucent reservoir allows fluid check at a glance Mounting bracket H1179 sold separately HPU measures 4" x 7 1/2" x 5 1/2" Uses automatic transmission fluid Includes pump, solenoid valves, reservoir and cover