Sierra 18-6011 Zinc Trim Tab Anode for Mercury Mercruiser and Honda Outboards

The Sierra 18-6011 is a zinc trim tab anode designed to protect your marine engine from galvanic corrosion in saltwater environments. This sacrificial anode directs corrosion away from critical components like shafts, propellers, rudders, and drive parts, preserving expensive engine components while the anode corrodes instead.

Key Features:

• Zinc alloy construction specifically formulated for saltwater use
• Bolt-on attachment style for secure installation
• Meets or exceeds OEM specifications for quality and performance
• Direct replacement for multiple OEM part numbers

Applications:

• Fits most Mercury/Mariner outboards 35 HP and above
• Compatible with all Mercruiser engines (except Bravo models)
• Fits Honda extension cases BF25, BF30, BF35, BF40, BF50 (1997-up)
• Mercruiser R/MR/Alpha One sterndrives (1983-1990 and prior drives)

Replaces OEM Part Numbers: Mercury/Mariner 31640, 31640A1, 31640A2, 31640A4, 31640B4, 72436A1, 97-31640Q4, Honda 41107-ZW1-003ZA, Mercruiser 316404

Important Note: This zinc anode is designed for saltwater applications only. For freshwater use, consider aluminum or magnesium anodes. Always inspect anode condition regularly and replace when significantly corroded to maintain proper engine protection.