Sierra 18-6121Z Zinc Trim Tab Anode for Yamaha Counter Rotation Outboard Motors

The Sierra 18-6121Z is a zinc trim tab anode engineered as a direct replacement for Yamaha counter rotation outboard motors. This sacrificial anode mounts on the trim tab of compatible Yamaha outboards and serves a dual purpose: providing critical galvanic corrosion protection to the lower unit and helping to adjust the running attitude of the boat by altering the trim tab angle.

Made from high-purity zinc alloy, this anode is designed to sacrificially corrode in place of the engine's metal components, absorbing electrochemical corrosion caused by exposure to saltwater and brackish water environments. Regular replacement of this anode is one of the most cost-effective ways to extend the service life of your outboard's lower unit.

Key Features:

• Zinc alloy construction for optimal galvanic protection in saltwater and brackish environments
• Direct OEM replacement — replaces Yamaha part numbers 6K1-45371-01-00 and 6K1-45371-02-00
• Specifically designed for Yamaha counter rotation (L-series) outboard motors
• Includes mounting bolt
• Meets or exceeds original equipment specifications

Cross-Reference Part Numbers: Yamaha 6K1-45371-01-00, Yamaha 6K1-45371-02-00, GLM 12843, Tecnoseal 01134, CMP CM6K14537102Z

Sierra marine parts are built to meet or exceed OEM specifications and are backed by Sierra's manufacturer warranty, making this a trusted choice for boat owners, marine technicians, and service shops.