Thanks to you kind fellows, I have learned exactly how to measure NPT fittings. Boy do I feel like a dope.
plumbingsupply.com/pipethreadsizing.html Funny, I got the plumbing merit badge, but that was a long, long time ago.
Still a mystery why someone put an extra valve on the water pump and if I had thought about it, it seems redundant.
Thank you gents,
Mark
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