Quicksilver 888761Q04 Aluminum Anode Kit - MerCruiser Bravo III Drives Complete six-piece aluminum anode kit with attaching hardware for fast and easy replacement Produced to Meet Mercury marine original equipment Manufacturer specifications to best protect your mercuries bravo III drive and engine Inspect anodes periodically for best protection and replace when seeing signs of corrosion or pitting Don't let corrosion damage your mercuries stern drive or engine Mercuries anodes meet or exceed mil-spec MIL-A-24779(SH) providing longer lasting protection than zinc anodes and are for us in fresh or salt water