In article . com, wrote:

However if you know the nominal size you do know the OD, that
is unambiguous.

For a given material, perhaps. As a general rule regardless of material,
definitely not: 3/4" steel, copper, and CPVC all have different OD.

--
Regards,
Doug Miller (alphageek at milmac dot com)

Nobody ever left footprints in the sands of time by sitting on his butt.
And who wants to leave buttprints in the sands of time?