CAT 6L2283 engine pencil zinc with square end plug.
Note that this pencil has the smaller 1/4-20 male thread to fit the square end plug, and will not fit a standard hex head type plug.
Square Plug
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zinc pencil length: 2-1/4"
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anode diameter: 3/8"
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anode thread size (male end) 1/4-20
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diameter of end plug 1/2"
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wrench size of end plug 3/8"
- U.S. Mil-Spec quality