In message , Peter
Hemmings writes
chris French wrote:
In message , Peter Hemmings
writes


What I intend to do is to replace the cast "T" and pipe to toilet
with plastic and to fit a cross pipe connector (sorry don t know
exact name) ready to drain shower/basin about one metre to the right




2. What diameter pipe must I use from the basin/shower?

Basins normally 32mm, Shower 40mm

Do you know if these must be kept separate to stop the old "gurgling"
effect in the basin when using the shower for instance?


Well, this one of those 'depends' situations . Ideally I think it is
best to keep them separate, so as to remove the risk of the problem.
Though when I did the bathroom on my old house ISTR that the basin was
connected to either the bath or shower waste pipe and I don't remember
any gurgling, so I guess it depends on various things.

i'd avoid combining them if I could though.

4. If I have to cut the old pipe (because I damaged it), is there a
neat way of connecting plastic as the only way I have seen is an
orrible rubber "gator" thingy!?
That is the only thing I have seen, but it might be that plastic
joining section might just be the right size if you are lucky - my
plastic pipe was a nice fit in my CI socket

What did you seal it with?

I used Cerafix 'Roof and Gutter sealant' - mostly because I had some and
it seemed suitable for the job - the plastic was a nice fit into the CI
so didn't need to fill a big gap.

Like this I guess:

http://www.screwfix.com/app/sfd/cat/...81553&id=42717


The sealant is black, looks like it might be bitumen based, but I've no
idea, doesn't seem to dry hard though - in fact didn't seem to dry
really at all.. I'd have thought a general purpose silicone sealant
would be fine though.
--
Chris French