6L3104Â engine pencil zinc with end plug. Note the size and threading of the pencil anode that is used with this plug.
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zinc pencil length: 1-1/2″
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anode diameter: 3/8″
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anode thread size (male end)Â Â Â 1/4-20
- end plug thread size 1/2-20
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diameter of end plug = 1/2″
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wrench size on hex plug = 5/8″
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U.S. Mil-Spec quality







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