"I think steamfitting would be rife with that sort of thing."
QUOTE Earlscourt_Lad.
On this side of the pond everthing is NPT, (National Pipe Thread) although I have never seen it
for sale for pipe or as offered in any fitting. The only time that I ever saw it mentioned was in
an appretice's layout of instruction (which I retain) and in the body of a "pipe/pipe fitting body"
for the base of a work bench.
As an aside, if one were to walk into a present-day supplier and
ask for a 2" swept Tee, would would be looked upon as an excentric and spend thrift odd ball.
Another 'fitting that I miss is The Dart Union - nonferrous to nonferrous coupling, whose factory
was located on Niagara Street within the same building as The National Casket Co/Dominion
Manufacturers. (But that's an other story.)
Regards,
J T