Mercury Replacement Aluminum Anode 31640T4 is a sacrificial anode that inhibits galvanic corrosion, protecting your engine from damage in both fresh and saltwater applications.
Fits Mercury/Mariner 30-200hp outboards plus all MerCruiser drives except Bravo drives
Helps protect gearcase housing from corrosion as it provides hydrodynamic trim force to your outboard and sterndrive to aid steering
Each anode is designed for fast and easy replacement with common tools
Mercury parts and accessories are backed by decades of experience in engineering, testing and manufacturing to provide the best fit, function and performance