Mercury - Quicksilver 822777T1 Aluminum Trim Tab Anode Mercury & Mariner Outboards MerCruiser Sterndrives 822777T1. Overview. Your trim tab does double duty - it fights corrosion and helps your boat steer straight. The Mercury 822777T1 Aluminum Trim Tab Anode is designed for Mercury and Mariner outboards (35HP and above) and MerCruiser sterndrives, providing corrosion protection and steering balance for boats running high-rake propellers.. Cast from high-quality aluminum, this OEM trim tab shiel