Engineered Durability for Seamless Bow Thruster Performance

Crafted specifically for Lewmar's 300TT series bow thrusters, this GRP tube measures 300mm in diameter, 9mm wall thickness, and 2000mm in length. Made from high-quality glass-reinforced plastic, it stands up to the harsh marine environment, resisting corrosion, UV exposure, and impacts that plague lesser materials. Boat owners and installers trust it for reliable tunnel installations where precision and longevity matter most.

Unlike standard PVC alternatives, GRP offers superior structural integrity without the weight penalty of metal, making it ideal for yachts, workboats, and recreational vessels up to mid-size. Its smooth interior minimizes drag on the thruster prop, ensuring efficient operation and quieter performance during docking or tight maneuvers.

Key Features That Set It Apart

• Precision Dimensions: Exact 300mm x 9mm x 2000mm fit eliminates guesswork, aligning perfectly with 300TT thruster kits.
• GRP Construction: Combines fiberglass strength with plastic flexibility—non-conductive, non-magnetic, and impervious to electrolysis in saltwater.
• Lightweight Design: Reduces hull stress and simplifies handling during retrofits or new builds.
• Smooth Bore Finish: Low-friction surface promotes optimal water flow, boosting thruster efficiency by up to 10-15% in real-world tests.
• Part Number 589702: Genuine Lewmar component for warranty compliance and hassle-free replacements.

Why GRP Tubes Excel in Bow Thruster Installations

In the demanding world of boating, bow thrusters transform challenging slips into confident approaches. This tube forms the critical tunnel pathway, channeling thrust precisely where needed. GRP's thermal stability prevents warping in extreme climates, from tropical bays to northern freezes, while its impact resistance handles accidental groundings or debris strikes.

For DIY enthusiasts or professional yards, its straightforward cutting and bonding—using epoxy or polyester resins—speeds up projects. Pair it with standard marine sealants for watertight seals that endure years of submersion. Regular inspections reveal minimal wear, often outlasting the thruster motor itself.

Installation Insights for Optimal Results

Begin by templating the hull position with the thruster flange for accuracy. Cut the tube to length if needed using a fine-tooth saw, then bevel edges for seamless joints. Secure with through-bolts or clamps, ensuring even spacing to avoid stress points. During trials, monitor for vibrations—GRP's rigidity typically eliminates them, unlike flexible composites.

Pro tip: In foam-core hulls, reinforce with additional laminates around the tunnel to distribute loads, enhancing overall vessel integrity. This setup not only supports the 300TT's 20-30kgf thrust but also maintains balance for fuel-efficient cruising.

Real-World Applications and Longevity

From sailboats navigating crowded marinas to powerboats fighting crosswinds, this tube powers precise control. Owners report installations lasting over a decade with basic care: annual hose-off and sealant checks. Its non-porous surface resists marine growth, cutting maintenance time compared to coated steel options.