Bennett Marine 18x9 Hydraulic Trim Tab System w/One Box Indication [189OBI]18x9 Hydraulic Trim Tab System with One Box Indication Hydraulic trim tabs are known for power, precision, and durability. Get the most from your boat, no matter what the load, speed, or sea conditions. Using the helm control, you can adjust the tabs individually or in unison to create the perfect cruising attitude. Increase speed and fuel economy, smooth a rough ride, and get on plane faster. Features: Get on plane fast, and stay on plane at