Mercury - Quicksilver Zinc Anode Plate Corrosion Protection Component Cast Zinc 34762A1. Overview. Galvanic corrosion is one of the toughest enemies your sterndrive faces, and the Mercury Marine 34762A1 Quicksilver Zinc Anode Plate provides a strong defense. Designed for MerCruiser TR and TRS drives, this 2.5" x 2.5" plate is built from high-purity zinc to protect critical metal components by corroding first - saving your drive from damage. It's a simple, affordable layer of protection that inst