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Posted

If that is a pic of your rad, why does the plug need replacement? A pic of the removed plug or the opening would be easier to figure out. Looks like a flanged, straight thread plug similar to an oil drain plug but it could be npt. I'm guessing 3/8 but a few measurements could narrow it down. A thread pitch gauge may be necessary or if it is for an optional fan temp sensor or switch, check the thread specs.

Posted (edited)

The thread is 1/2-20 , depth is 3/8.

The pic isn't my car, but same radiator.  there are identical plugs at the top and bottom tanks.  I am hoping to find a plug from a damaged donor core.  brass preferred. 

Edited by IamScotticus
Posted

A new, similar plug with sae thread can be found from an industrial hydraulics supply. If it were metric thread, a similar plug is available as a replacement oil drain. 

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