Mercury - Aluminum Anode For MerCruiser Alpha One Gen II Drives 806189T1. Overview. Corrosion is a constant battle for anyone running a sterndrive, and the Mercury 806189T1 Aluminum Anode is your front-line defense. Designed specifically for MerCruiser Alpha One Gen II drives, this small but important piece takes the damage so your engine doesn't have to. It's mounted on the trim cylinder arm or rod, where it absorbs corrosion before it can attack the metal parts that keep your boat moving. Buil