Tecnoseal R7 Rudder Anode - Zinc - 6-1/2" Diameter

The Tecnoseal R7 Rudder Anode in zinc is purpose-built cathodic protection for marine propulsion and steering systems exposed to saltwater, brackish, and freshwater environments. After decades on the water, any serious boater knows that galvanic corrosion silently attacks underwater metal—particularly rudders and trim tabs—unless an active sacrificial anode intercepts electrolytic action. This 6-1/2-inch diameter zinc anode is engineered to corrode preferentially, drawing corrosion away from steel and aluminum components and extending the operational life of your vessel's critical steering apparatus.

Tecnoseal's R7 anode leverages zinc's natural electrochemical superiority in saltwater applications, delivering robust galvanic protection through direct contact with the rudder shaft or blade assembly. At 8.8 pounds of pure zinc material, this anode provides substantial protection duration before requiring replacement—typically one to three years depending on water salinity, boat usage, and electrical bonding integrity. The compact 7 x 3 x 7-inch profile fits retrofit installations while maintaining sufficient surface area and mass to sustain reliable cathodic potential across the protected structure, preventing the pitting and structural degradation that can compromise steering reliability and safety.

This anode suits inboard cruisers, fishing vessels, commercial operators, and any boat running a conventional through-hull rudder system in corrosive waters. Installation requires secure mechanical fastening to the rudder post or blade, ideally with electrical continuity to the vessel's bonding system for maximum effectiveness. Divers and haul-out inspections should include anode condition checks every season; when the zinc becomes pitted, wasted, or reduced by half its original mass, replacement is essential to prevent rapid deterioration of underlying steel and maintain steering integrity throughout the boating season.