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Old 10-14-11, 08:49 AM   #9
Xringer
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Look at the specs on the NPT S40 3/4" nipples.
http://www.msi-products.com/Specs/Br...ples-Specs.pdf
Sounds very close to your mystery pipes..

Lift up that fiberglass and stick your finger in the hole and see if you can
feel any threads.. If it's a nipple, there will be a few showing..



Anyways, I wonder if you could turn-down 1/2" nipples (using a lathe)
so they would fit inside your pipes, for soldering??
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