AHJ-4VHD-B-DPT-H Marine ATLAS 4 Heavy Duty Hydraulic Jack Plate The T-H Marine ATLAS Hydraulic Jack Plate is renowned for its heavy-duty construction, suitable for larger outboards up to 400 hp. As the industry's leading hydraulic jack plate, it is the top choice for both fishing professionals and boat manufacturers alike. Why Choose the ATLAS Hydraulic Jack Plate? The most trusted hydraulic jack plate in the market. Factory-installed by more boat manufacturers than any rival product. Preferred by profession