In article , Harold & Susan Vordos says...

Pipe is measured by it's internal diameter, and is not usually very precise.
Regardless of the schedule, the outside diameter remains constant (at least
in theory).

This was explained well to me, by a plumber - that the imporant
thing about "pipe" is what's flowing *inside* of it, so the
ID that counts.

Four inch cast iron pipe is just about the right size for...

Yep!

Jim


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