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: 2″
- anode diameter:Â 5/8″
- anode thread size (male end)Â 7/16-14
- end plug n.p.t = 1/2″
- end plug wrench size= 7/8″
- U.S. Mil-Spec quality
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