Aluminium Anode for Johnson-Evinrude 4-7.5HP RO:432397, 334451

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Aluminium Anode for Johnson-Evinrude

Lower unit anode for J/E 4-7.5HP

Reference to: 432397, 334451

The anode is made from a metal alloy with a more ""active"" voltage (more negative electrochemical potential) than the metal of the structure it is protecting (the cathode). The difference in potential between the two metals means the sacrificial anode material corrodes in preference to the structure.