Tecnoseal Lewmar 140 Bow Thruster Zinc Disc Anode

The Tecnoseal Lewmar 140 Bow Thruster Zinc Disc Anode is a marine-grade sacrificial anode engineered for saltwater bow thruster systems. Built for boat owners who operate in corrosive marine environments, this component protects your 140mm diameter thruster tunnel from electrolytic corrosion and galvanic degradation—damage that can compromise system integrity and lead to costly repairs. Crafted by Tecnoseal, a trusted name in marine cathodic protection, this zinc disc anode is essential maintenance for extending thruster lifespan and ensuring reliable performance season after season.

The anode is manufactured from high-purity zinc—the preferred material for saltwater applications because it corrodes preferentially to steel and aluminum components, effectively sacrificing itself to preserve the thruster mechanism. At 37mm in diameter and compatible with Lewmar 140TT tunnel thrusters, this disc is precision-engineered to fit snugly within the thruster housing and deliver consistent protection. The compact 2 x 1 x 2-inch form factor weighs just 0.15 lbs, making installation and replacement straightforward without requiring specialized tools or extensive downtime. Zinc anodes must be inspected and replaced regularly—typically annually in heavy saltwater use—to maintain full protective effectiveness.

This replacement anode is ideal for commercial fishing vessels, cruising sailboats, and recreational powerboats that rely on bow thrusters for precise maneuvering in tight anchorages and marina approaches. Anyone operating in salt water should purchase in pairs—one for immediate replacement and one as a backup—to minimize downtime during routine maintenance cycles. Compatible exclusively with Lewmar 140mm diameter tunnel thrusters (original part number 589150), verify your thruster specifications before ordering to ensure proper fit and function.