On Mon, 29 Dec 2008 18:26:41 GMT, The Medway Handyman wrote:

Will a 22mm compression fit or do I need an adaptor?

Ideally, as others have mentioned, a 3/4" olive. But you can get away with
murdering up a soft copper 22mm olive onto 3/4" pipe, might not be so
successful with a hard brass 2mm olive.

--
Cheers
Dave.