Sierra 18-6012 Zinc Trim Tab Anode for MerCruiser Stern Drives

The Sierra 18-6012 is a high-quality zinc trim tab anode designed specifically for MerCruiser stern drive applications. This replacement anode provides essential galvanic corrosion protection for your lower unit components in saltwater and brackish water environments.

Key Features:

• Constructed from marine-grade zinc for superior sacrificial protection
• Direct replacement for R/MR/Alpha One stern drives (1983-1990 and prior models)
• Fits over transom assembly on compatible MerCruiser stern drive units
• Designed to meet OEM specifications for reliable performance
• Easy bolt-on installation with basic tools

This sacrificial anode works by attracting corrosive electrical current, forming an oxide layer on itself rather than on expensive engine components like the gearbox housing and lower unit. Regular inspection and replacement of trim tab anodes is critical preventative maintenance that extends the life of your stern drive. Always verify adequate propeller clearance after installation.