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Perhaps the most versatile anode material, the specially formulated aluminum alloy used in these anodes is an ideal choice as it not only works better than zinc anodes in saltwater, it protects your boat in brackish water, as well.
If your boat is used in both salt and tidewater environments for extended periods, aluminum is the best all around choice.
These non-drilled commercial anodes allow for custom installations, as well as production runs of particular mounting bolt patterns