In article ,
Eeyore wrote:
The water pipe and electrical conduit in my house is 1 inch, 1/2 inch,
3/4 inch. I think any transition will still require stores to stock
fittings in both metric and inch for generations to come.

It was like that here too. Now we have 25, 19 and 12 mm. They seem to be
compatible.

Copper tube equivalents to 1, 3/4 and 1/2in are 28, 22 and 15mm. And are
compatible from any maker. Plastic tends to vary outside diameter wise so
tend to need fittings from the same maker.

--
*A day without sunshine is like... night.*

Dave Plowman London SW
To e-mail, change noise into sound.