Performance Metals Navalloy® aluminium Mercruiser Alpha 1 Gimbal Housing Bolt Head Nut Anodes used on Alpha 1 outdrives. Replaces Mercury 55989Q 9. This product includes 2 neoprene washers and head nut anodes manufactured to the military specification MIL-DTL 24779, making them suitable for use in all water types - salt, brackish or fresh.

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

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