Item description from the seller:

• Compact powerhouse that 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
• Lexan cover protects electrohydraulic unit from occasional wash down and translucent reservoir allows fluid check at a glance
• 12 Volt power