In article .com,
Aidan wrote:
It might be Bundy tube, rolled steel tube galvanized or copper coated.
I think it's used for brake-pipes, compressed air & hydraulics.

If so, you don't use ordinary compression fittings with an olive which
won't bite into the pipe properly. You use a rolled flange on the end.

--
*I couldn't repair your brakes, so I made your horn louder *

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