Transom bracket anode 8M0057772 is for use on Mercury or Mariner 135-150hp 4-stroke outboards. This aluminum anode is for fresh water or salt water use. The anode is 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 owner's manual or service manual for specific applications and replacement instructions. The Quicksilver brand is the leader in delivering uncompromising engine oils, parts and accessories to the marine industry for over 65 years. Quicksilver is the premier supplier of Mercury Marine Original Equipment replacement engine parts, oils, and accessories, but also works to serve all Original Equipment brands in the marine and powersports industries. It has earned a loyal following by providing the highest quality products that are tested through some of the most rigorous environments and testing procedures. No aftermarket company comes close to the level of research and design as Quicksilver; buying Quicksilver is buying performance, protection and peace of mind.