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It's NPT tapped hole , you can purchase an NPT plug with an Allen recess in it , go to your local Vatozone , Advance auto or the like and check the fashion performance aisle

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I know where to get NPT plugs, but are you saying that I should just thread it in without tapping it first?

Scott

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if it is a tapped hole already , which it should be , why would you feel the need to tap it ??? NPT is a TAPERED thread as stated above so you will see 2 different sizes in the hole ...

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