Aluminum anode kit 8M0137814 is for use on the anti-ventilation plate on Mercury 175 hp through 300 hp and 450R 3.4L V6 and 4.6L V8 4-stroke outboards (s/n: 2B529482 & above). These aluminum anodes are for fresh water or salt water use. The anodes are important in the prevention of corrosion of aluminum or stainless steel engine parts. Inspect anodes periodically for best protection and replace when seeing signs of corrosion or pitting. Never paint an anode. See your owners manual or service manual for specific applications and replacement instructions. The Quicksilver brand has been the marine industry leader in delivering premium engine lubricants, accessories and original equipment replacement parts for more than 65 years. It applies the same quality standards as a supplier of lubricants and replacement parts for many original equipment brands in the powersports industries. Quicksilver has earned a loyal following by providing the highest quality products, validated through some of the most rigorous environments and testing procedures. No aftermarket company comes close to matching the level of research and design that goes into Quicksilver products. Buying Quicksilver is buying performance, protection and peace of mind.