don't know the size, but i just bought one of those fancy brass plugs w/o-ring replacement from GBR just the other day. lots better than the plastic ones.
yeah, wish i had had the foresite to buy one earlier, but i didn't and i need the truck to be on the road now and not spewing coolant. guess i will just go and buy a few different sizes and use that until i can get a real brass plug from someone.
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