Join Date: Mar 2002
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Re: What a day - Radiator troubles rant.
Internal plug or external plug?
Most internal plugs are the common 1/2, 3/8, or 1/4" sizes.... Not sure where you can get an internal 5/16" square drive, but you might check plumbing supply shops. Worst comes to worst, you can find the external square pipe plug with the right size head and grind some flats onto the threaded end for a wrench. Maybe you can find a chunk of 5/16" square solid steel stock. Cut off enough so you can use it in a wrench as a drive.
External square head plugs are pretty common for pipe plugs.... and you can use a standard 12-point socket, open-end wrench, or 8-point socket to get them off.