Martyr anode protects the transom from corrosion in salt and brackish water. Yamaha Aluminum Transom Bracket Anode | Martyr CM6G54525101A Yamaha transom bracket anode Aluminum anodes for use in brackish and salt water applications Fits various Yamaha 200-250 HP outboards 8 in. length 1.8 in. width 2 in. height Aluminum replacement for Yamaha zinc anode 6G5-45251-01-00, 6G5-45251-00-00, 6K7-45251-00-00 For zinc see p/n cm6G54525101Z