Mercury - Anode Plug Kit Corrosion Protection Marine Alloy 8M0135965. Overview. If you run a small outboard, you know how much those engines give back-quiet mornings on the river, long afternoons chasing fish, or easy evenings cruising back to the dock. But even the most reliable little motor needs protection from the things you cannot see, like the slow creep of galvanic corrosion. The Mercury 8M0135965 Anode Plug Kit feels like one of those behind-the-scenes heroes that keeps everything steady