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Outboard motor anode.
An example of the element Zinc

Sample Image
Zinc Outboard motor anode
Outboard motor anode.
This is another example of a sacrificial anode, which electrochemically protect a more valuable (typically steel) object from corrosion. In this case, the object to be protected is an outboard motor. How often the anode has to be replaced depends on the kind of water the motor is used in: Around here I am told they last pretty much forever.
Source: Boat Shop
Contributor: Theodore Gray
Acquired: 22 August, 2003
Price: $10
Size: 2"
Purity: 99%
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