On 27/01/2018 18:41, GB wrote:

Dismantling some ancient piping, I got left with the hot and cold feed
in some old steel pipe. There was some sort of brass connector into that
which was so firm that I could not budge it. Sticking out of that was a
bit of 3/4" copper pipe with one end of a compression fitting, ie the
nut bit and an olive.

Easy! (I wrongly thought.) I'll just attach my 22X15mm compression
fitting to that. Of course, it doesn't fit. The screw thread isÂ* different.

What do I need to find to connect up to the old imperial nut?
Preferably, it should be an elbow and reduce to 15mm copper, but quite
frankly I'll settle for whatever fits. The plumbing shop had very little
imperial stuff in stock, and nothing at all that fitted.

I managed to salvage some of the old bits of pipe and it's all capped
off for now, thank goodne


If there is enough of a pipe stub, then cut off close to the olive,
otherwise, carefully remove the olive (using an olive puller or by
slitting not quite through with a Dremel and then twisting open with a
screwdriver in the slot). Remove the nut. You can then use a brand-new
22mm compression fitting with a new 3/4" olive.

SteveW