In an earlier contribution to this discussion,
bob wrote:

I am fitting 22mm compression stop end to a cold water pipe in my
bathroom and was wondering how far onto the pipe should the
compression ring go? Many thanks.

There's a shoulder inside the fitting which butts against the end of the
pipe. So push the fitting - with the olive inside - onto the pipe as far as
as it will go, and do up the nut so as to nip the olive onto the pipe. If
you take it apart again, you will typically find about 5mm of pipe
protruding beyond the olive - but the exact amount varies from fitting to
fitting.
--
Cheers,
Roger
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