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Briggs Vanguard VTwin oil drain plug question

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Anyone know the thread size of the oil pan drain plug, on a 23 Vanny Horizontal Twin?

I thought I knew, but am seeing a few different plug sizes. I would like to buy a drain extension prior to actually working on the engine. I can't really go to where the engine is currently at, and pull the plug then run around to find what I need. I'd like to have it before I get there if that makes sense. I really only want to make this big, oily mess once, on my application.


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