On Fri, 25 Jun 2010 23:03:12 -0500, Gordon Shumway
wrote:

On Sat, 26 Jun 2010 03:40:58 GMT, (Doug Miller)
wrote:

In article unications, (Robert Bonomi) wrote:

Plumbing stuff is specced by inside diameter.

Incorrect.

O.D. is whatever the manufacturer feels like.

Incorrect.

Pipe is specified by OD; the ID is determined by the nominal OD and the wall
thickness.

Think about it: if OD were "whatever the manufacturer feels like" you wouldn't
be able to use Manufacturer A's fittings with Manufacturer B's pipes. It's
precisely to ensure such interchangeability of pipes and fittings across
brands that the sizes are specified by OD, not by ID.

You are wrong and I am man enough to admit it. Hoses are measured by
I.D. Tubing is measured by O.D.

For example with copper. We have various "Types," L, M, N and there
may be others. For a given size they are all the same O.D. The
different wall thickness will yield a different I.D. but they will all
use the same fittings because their O.D.'s are the same.

Doug,

Never mind what I just said. I had a massive brain fart and have now
recovered. You said what I said after I had too many beers.