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RE: Pipe sizes

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Title: RE: Pipe sizes

Bill, I wasn't positive that SCH 10 did, and as you indicate, it does not. I was really just trying to get the low down on the "schedule" thing.  I wasn't sure that that the constant OD was the case in all SCH #'s, but it is.  Where, historically, does the SCH thing come from, and is it true of different materials (PVC, steel, etc.)?