Yamaha Anode Cover Assembly 69J-11301-00-00. Overview. The Yamaha 69J-11301-00-00 Anode Cover Assembly is a genuine original equipment manufacturer component designed to house and protect the engine's sacrificial anode. This assembly plays an important role in helping protect internal engine components from corrosion caused by prolonged exposure to water and harsh marine environments.. The sacrificial anode works by attracting corrosive elements that would otherwise damage critical engine parts.