Tecnoseal Zinc Sidepower Anode f/SP550 HYD, SH420 & AH550 Sleipner Bow Thruster Propellers

The Tecnoseal Zinc Sidepower Anode for SP550 HYD, SH420 & AH550 Sleipner Bow Thruster Propellers is a marine-grade sacrificial protection system engineered for salt-water vessel operators who demand long-term corrosion control. If you run a center console, express cruiser, or multi-engine offshore rig, galvanic corrosion will systematically destroy your thrusters' internal mechanisms—unless you install active cathodic protection. This zinc anode intercepts that electrochemical attack before it reaches your thruster's working components, extending service intervals and preventing catastrophic mid-season failure.

Tecnoseal's zinc formulation is optimized for salt-water immersion environments where aluminum and steel components are most vulnerable to galvanic corrosion. The anode works by oxidizing preferentially to the thruster housing and propeller hardware, sacrificing itself in a controlled manner while leaving your expensive Sleipner bow thruster intact. Weighing 2.4 lbs with compact dimensions of 3 x 2 x 3 inches, this unit mounts directly to compatible SP550 HYD, SH420, and AH550 thruster models. Zinc's lower electrochemical potential makes it the industry standard for salt-water applications, offering superior protection longevity compared to aluminum alternatives in high-salinity environments.

Operators of Sleipner-equipped vessels—whether cruising the Atlantic, Gulf, or Caribbean—should replace this anode every 2–3 seasons, depending on water salinity and thruster duty cycles. Installation is straightforward for anyone comfortable with basic marine hardware removal; note that mounting screws are not included, so source stainless fasteners rated for your specific thruster model before service. This anode is not suitable for fresh-water systems; salt-water vessels only. Verify your thruster model (SP550 HYD, SH420, or AH550) against the Sleipner nameplate before purchase to ensure correct fit and maximum corrosion protection.