Performance Metals Navalloy® aluminium Trim Tab Anode used on most Mercury and Mariner outboards 35hp and up and Mercruiser Alpha 1 outdrives. Replaces Mercury 31640Q 4 and Honda 41107-ZW1-003ZA.

This anode includes the exclusive, patented "red spot" wear indicator and is manufactured to the military specification MIL-DTL 24779, making it suitable for use in all water types - salt, brackish or fresh. This product comes with mounting hardware and installation instructions.

Note: Aluminium anodes are supplied as standard with Mercury and Mercruiser drives. Use of zinc anodes will invalidate the warranty.

Key Features

Navalloy anodes will last up to 30% longer than zinc and up to 4 times longer than magnesium!

Can be used on any type of hull material - aluminum, steel, fibreglass or wood

Suitable in all water types - salt, brackish and fresh

Can be left permanently immersed or used on boats that are regularly lifted in and out of the water

Patented Red Spot Wear Indicator - when the red spot appears, it’s time to change

Navalloy anodes are 20 times more eco-friendly than zinc anodes