On 2017-03-09, charles wrote:

In article ,
wrote:
On Wednesday, 8 March 2017 18:45:05 UTC, Adam Funk wrote:
Well, I had one hand on a spanner on the nut that I was loosening, &
the other one on a spanner on the hex end of the flexible connector, so
I didn't have any more hands left to hold the service valve body & its
top nut.

Why can't compression fittings come with lugs so they can be screwed to
the wall, to stop them wobbling when the nuts are tightened?

you can get tap connectors which do exactly that.

I've never seen such a thing but it sounds interesting --- got a link?