Quicksilver 888761Q03 Aluminum Anode Kit - MerCruiser Bravo II and III Drives Complete four-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 II and bravo III drive and engine Inspect anodes periodically for best protection and replace when seeing signs of corrosion or pitting to help keep your maintenance costs down Don't let corrosion damage your mercuries stern drive or engine and reduce your boating pleasure 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