Mercury - Aluminum Anode Kit MerCruiser Bravo One Series Aluminum Construction 888758K01. Overview. If you've owned a sterndrive long enough, you've seen what corrosion can do when it's left unchecked. It starts small-just a little roughness here, a bit of pitting there-then one day you're staring at metal that used to be smooth and solid. That's why anodes are one of those parts I never treat as optional. They're the quiet guardians of your drive, taking the hit so the expensive stuff doesn't h