Creates hydraulic pressure to lower and raise the trim tabs. It employs two solenoid valves. The solenoid valves lock tightly to secure the tabs in place. Strength to lower and hold even the largest tabs in place. A Lexan cover provides water resistance to the electrohydraulic unit, and the translucent reservoir allows fluid check at a glance. Uses automatic transmission fluid. Includes pump, solenoid valves, reservoir and cover.219-H1179 Mounting bracket sold separately.