Navalloy aluminum engine pencil with end plug-performs much better than zinc in fresh water.      Can be used in all water types
- zinc pencil length: 1-3/4″
- anode diameter: 3/8″
- anode thread size (male end)Â 5/16-18
- end plug n.p.t = 1/4″
- end plug wrench size= 9/16″
- U.S. Mil-Spec quality
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