Lewmar 300 Stern Thruster Tunnel Kit

Enhance your boat's maneuverability with the Lewmar 300 Stern Thruster Tunnel Kit, a precision-engineered component designed specifically for seamless integration with the 300TT thruster. This kit provides the essential housing and mounting structure, ensuring a robust and watertight installation that stands up to the harshest marine conditions. Whether you're docking in tight marinas or navigating crowded harbors, this tunnel kit transforms challenging maneuvers into confident, controlled operations.

Engineered for Superior Performance and Reliability

Crafted from high-grade composite materials, the Lewmar 300 Stern Thruster Tunnel Kit offers exceptional corrosion resistance and structural integrity. Its streamlined design minimizes drag while maximizing thrust efficiency, allowing your vessel to respond swiftly to helm inputs. Boat owners appreciate how this kit eliminates the guesswork in thruster setups, delivering consistent power exactly where you need it—right at the stern.

• Precision Fit: Tailored dimensions ensure a perfect match with Lewmar 300TT thrusters, reducing installation time and potential alignment issues.
• Watertight Seals: Integrated gaskets and flanges prevent leaks, safeguarding your hull integrity even during prolonged submersion.
• Lightweight Yet Tough: Balances minimal added weight with the durability to handle repeated thrust cycles without deformation.
• Universal Mounting Options: Flexible flanges adapt to various hull thicknesses and transom configurations common in modern yachts and motorboats.

Unlock Effortless Stern Control for Any Vessel

Installing a stern thruster tunnel like this one addresses one of the biggest pain points for skippers: poor astern handling. In crosswinds or strong currents, a well-fitted tunnel kit provides lateral thrust that pivots your boat precisely, making single-handed docking a reality. Imagine gliding into a slip sideways without the drama of prop walk or bow swing— that's the real-world advantage this kit delivers.

From mid-sized cruisers to larger sportfishers, this tunnel enhances safety and enjoyment on the water. It's particularly valuable for boats over 40 feet, where stern momentum can turn routine tasks into high-stress events. Pair it with your existing 300TT thruster for a setup that feels like an extension of your instincts at the helm.

Installation Made Straightforward for DIY Enthusiasts and Pros

While professional installation is recommended for optimal results, the Lewmar 300 Stern Thruster Tunnel Kit simplifies the process with pre-molded components and clear alignment guides. Start by marking your transom cutout based on the thruster specs, then secure the tunnel with marine-grade fasteners. Key tips include:

1. Double-check hull laminate thickness to select the right flange extensions if needed.
2. Apply sealant liberally around all mating surfaces for a bombproof seal.
3. Test-fit the thruster assembly before final torquing to avoid misalignment.
4. Ensure adequate clearance for prop rotation and anode access during maintenance.

Many boaters report completing the tunnel install in a weekend, saving on labor costs without compromising quality.

Built to Last in Demanding Marine Environments

Lewmar's commitment to marine innovation shines through in this kit's UV-stabilized composites and reinforced stress points. It resists galvanic corrosion, gelcoat blistering, and impact damage from debris—common issues that sideline lesser tunnels. Regular inspections focus on seal integrity and fastener tightness, keeping your setup reliable season after season.

Frequently Asked Questions