The Martyr Rudder & Trim Tab Sacrificial Anode magnesium rudder/trim tab anodes from Martyr are purpose-built sacrificial anodes designed to be mounted on a vessel’s rudder or trim tabs to protect those underwater components from galvanic and stray current corrosion. Made from high-purity magnesium alloy — which has a higher oxidation potential than zinc or aluminum — these anodes are especially effective in freshwater environments where corrosion rates can be more aggressive and electrolytes less concentrated. They’re supplied in paired halves with stainless steel hardware and retaining washers for secure, easy installation underwater, and as they corrode in place they sacrifice themselves to protect the more expensive metal parts of the boat. Choosing magnesium versions like this helps prolong the life of rudders and trim tabs by providing reliable electrochemical protection tailored for predominantly freshwater use.

• Rudder anodes are sold in pairs, with stainless steel bolt and nut.
• Easy installation underwater
• Bolt retaining washers prevent the anode from falling off