Navalloy aluminum engine pencil with end plug-performs much better than zinc in fresh water. Can be used in all water types
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zinc pencil length: 2"
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anode diameter: 5/8"
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anode thread size (male end) 7/16-14
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end plug n.p.t = 1/2"
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end plug wrench size= 7/8"
- U.S. Mil-Spec quality