Zinc Anode For Yamaha Outboards 200 - 350 HP Flat Trim Tab Zinc Anode Replaces 6CE-45373-00 Base Diameter: 4" Threaded Mounting Hole: M10 x 1.25mm Supercedes 61A-45371-00-00. Fits newer models of Yamaha 200 to 350HP outboards. US Military Grade Zinc Anode. Zinc Is For Saltwater Use.