On Sun, 09 Jul 2006 22:01:58 +0100, F wrote:

I've got a chrome bottle trap on the way from Screwfix (10004). Anyone
able to tell me what (and where) do I need to make the connection to
take the waste out through the cavity wall to the drain outside?


32mm push-fit or compression.

You can get a push-fit x solvent-weld coupler (from BES & other
proper plumbers merchants) which I've used to join to fixed pipework
running through walls etc.