
01-27-2008, 05:12 PM
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Deity
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Join Date: Jul 2004
Location: Saint Regis Falls, NY, USA.
Posts: 3,336
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chances are the steel pipe plug is "welded, rusted" in place. a 5/16" drill is the size for a one eighth inch pipe tap. I would center punch the plug and drill in progressively larger sizes up to the 5/16" bit. then run your tap in slowly. if it taps steel you'll have a spiral chip come out. if its in cast iron, the chips are just cast iron chips.
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