Tecnoseal R5MG Rudder Anode - Magnesium - 5" Diameter

The Tecnoseal R5MG Rudder Anode in magnesium is essential cathodic protection for any serious boater or angler who relies on their vessel's steering system. After years on the water, you learn that corrosion doesn't announce itself—it works silently beneath the surface, compromising rudder integrity when you need it most. This 5-inch diameter magnesium anode sacrifices itself to protect your rudder from galvanic corrosion, extending component life and ensuring responsive, reliable steering in both saltwater and freshwater environments.

Magnesium anodes work through galvanic protection by becoming the sacrificial metal in the electrochemical corrosion process. Because magnesium is more electronegative than steel rudder components, it corrodes preferentially, preventing rust and pitting on your rudder itself. The Tecnoseal R5MG's 5-inch diameter and compact 6 x 3 x 6-inch profile allows straightforward installation on standard rudder posts without requiring major modifications. At just 1.2 pounds, this anode provides substantial protection while maintaining minimal weight impact on vessel balance and performance.

Whether you fish offshore, cruise coastal waters, or maintain a recreational fishing boat, the Tecnoseal R5MG Rudder Anode is a cost-effective maintenance investment that prevents expensive rudder replacement or repair. Experienced captains understand that replacing a corroded rudder can cost thousands and sideline your boat during critical fishing or boating season. This magnesium anode is designed for boats with 5-inch diameter rudder posts and should be inspected annually and replaced when consumption reaches approximately 50 percent. Installing fresh anodes every 2–3 years, depending on water salinity and usage, keeps your steering system protected and your boat running reliably.