T-H Marine Z-Lock 4" Set Back Manual Single Adjust Jack Plate – JPZ-4-DP

The T-H Marine Z-Lock 4" Set Back Manual Jack Plate (JPZ-4-DP) delivers dependable engine height adjustment and improved on-water performance in a compact, lightweight design. Ideal for boaters who want precise tuning without the complexity of hydraulic systems, this manual jack plate allows you to dial in optimal engine height for improved acceleration, handling, and shallow-water operation.

Featuring Z-Lock™ single-adjust technology, the plate securely locks the engine in position, preventing slippage or movement during high-speed runs or heavy loads. The 4-inch setback improves hull balance and propeller efficiency while maintaining a minimal transom extension—making it a great choice for bass boats, bay boats, and performance-oriented outboard applications.

Constructed from high-strength aluminum with a polished finish, the Z-Lock jack plate offers excellent corrosion resistance and long-lasting durability in both freshwater and saltwater environments. Designed and manufactured in the USA, T-H Marine Z-Lock jack plates are trusted for their simplicity, strength, and reliable performance.

Technical Specifications

• Model: Z-Lock Manual Jack Plate

• Part Number: JPZ-4-DP

• Setback: 4 inches

• Adjustment Type: Manual, single-adjust

• Material: High-strength aluminum

• Finish: Polished

• Application: Outboard engines

• Use: Freshwater and saltwater

Benefits

• Improves hole shot, top speed, and handling

• Optimizes engine height for shallow water operation

• Enhances propeller efficiency

• Budget-friendly alternative to hydraulic jack plates

Applications

• Bass boats

• Bay boats

• Flats boats

• Performance outboard boats

• Shallow-water fishing boats

Why Choose the Z-Lock 4" Manual Jack Plate

The T-H Marine Z-Lock JPZ-4-DP is ideal for boaters seeking performance gains with minimal complexity. Its secure locking system, compact setback, and polished aluminum construction make it a reliable and cost-effective upgrade for a wide range of outboard boats.

Summary for the User

The JPZ-4-DP is a "set-it-and-forget-it" tool that helps you find your boat's ideal engine height for better top-end speed and fuel economy. It is significantly lighter and more affordable than hydraulic alternatives, making it a favorite for bass boats and aluminum fishing boats.

Installation Tip: When mounting, always use a high-quality marine sealant on your transom bolts. To find your "sweet spot," adjust the plate in 1/4-inch increments and test your water pressure and GPS speed after each move.

WARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.

Manufacturer : T-H Marine Supplies
Manufacturer Part No : JPZ-4-DP