Our V351 Hydraulic Power Unit (HPU) is a power house. Measuring a compact 4" x 7-1/2" x 5-1/2", the HPU has the strength to lower and hold in place even our largest tab. Two solenoid valves lock tightly preventing water pressure from retracting the tabs. A lexan cover protects the electro-hydraulic unit from an occasional wash down and a translucent fiberglass reservoir allows you to check the fluid level at a glance. For easy installation, the HPU is held in place by a sturdy mounting bracket. The hydraulic power unit is the driving force behind our trim tab system.