Re: Core plug fitting question-what sealent to use?
John Kennard
Green Loctight if it is still available? Used to use it 40 years ago with this type of core plug; it sets rock hard and seals in cooling systems. The others are right no sealant required but any modern loctight product would suffice I would use bearing fit because the hotter it gets the harder it sets & seals. John Kennard.
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