Mercury – Aluminum Gearcase Anode | Corrosion Protection Series | Aluminum | 8M0177453Mercury Aluminum Gearcase Anode Corrosion Protection Series Aluminum 8M0177453 Overview If youve owned a boat long enough, you know corrosion isnt something you notice in a single moment. It creeps in quietly a little pitting here, a change in color there until one day the damage is unmistakable. Thats why a dependable anode feels like a small but essential promise every time you drop the boat in the water. The Mercury Aluminum Gearcase Anode