CAT 6L2283 engine pencil zinc-select from the drop down box the pencil with the correct thread size (male end) that corresponds to the end plug you are using.
For Square Plug For Hex Plug
- zinc pencil length: 2-1/4" 2-1/4"
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anode diameter: 3/8" 3/8"
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anode thread size (male end) 1/4-20 5/16-18
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U.S. Mil-Spec quality