I'm installing a Ideal Standard 'Space' back-to-wall' wc.  A high level 
concealed cistern sits within a boxed-out wall, which will also contain a 
stub stack,  directly behind the wc.

If I measure everything correctly: height etc. is there anything to stop me 
connecting the porcelain horizontal outlet of the pan, directly into a 
branch connection on the stub stack. I'm using hepworth stack plastic 
drainage with rubber ring seal which fits nice and snug over the outlet from 
the pan.

I know you often use a wc connector, which might be straight or elbowed in 
some way and has more rubber fins in the seal, but using a straight 
connector in line will increase the distance between the wc pan and the 
stack, defeating the whole purpose of using a space-saving wc arrangement.

I don't want this to leak for obvious reasons.

Thanks once again.

KB, Oxford

In an earlier contribution to this discussion,
Kevin Brady   wrote:


> I'm installing a Ideal Standard 'Space' back-to-wall' wc.  A high
> level concealed cistern sits within a boxed-out wall, which will also
> contain a stub stack,  directly behind the wc.
>
> If I measure everything correctly: height etc. is there anything to
> stop me connecting the porcelain horizontal outlet of the pan,
> directly into a branch connection on the stub stack. I'm using
> hepworth stack plastic drainage with rubber ring seal which fits nice
> and snug over the outlet from the pan.
>
> I know you often use a wc connector, which might be straight or
> elbowed in some way and has more rubber fins in the seal, but using a
> straight connector in line will increase the distance between the wc
> pan and the stack, defeating the whole purpose of using a
> space-saving wc arrangement.
>
> I don't want this to leak for obvious reasons.
>
> Thanks once again.
>
> KB, Oxford


*If* it seals properly on the pan outlet, it may be ok. Most pans I have
seen have slightly oval outlets - and proper pan connectors have a lot of
bungy rubber inside to allow for this - whereas fittings designed to take
110mm *round* plastic pipe don't.

Does the stub stack have to be *directly* behind the pan? If you could
offset it a bit, you could use a 90 degree pan connector, and go into the
*side* of the stack. That way, the pan would still be well back.
-- 
Cheers,
Set Square
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"Kevin Brady"  wrote in message 
news:PFJRe.5520$x4.4686@newsfe2-gui.ntli.net...

> I'm installing a Ideal Standard 'Space' back-to-wall' wc.  A high level 
> concealed cistern sits within a boxed-out wall, which will also contain a 
> stub stack,  directly behind the wc.
>
> If I measure everything correctly: height etc. is there anything to stop 
> me connecting the porcelain horizontal outlet of the pan, directly into a 
> branch connection on the stub stack. I'm using hepworth stack plastic 
> drainage with rubber ring seal which fits nice and snug over the outlet 
> from the pan.
>
> I know you often use a wc connector, which might be straight or elbowed in 
> some way and has more rubber fins in the seal, but using a straight 
> connector in line will increase the distance between the wc pan and the 
> stack, defeating the whole purpose of using a space-saving wc arrangement.
>

I had a similar dilemma I think to the one you are describing. I was joining 
the WC pan to a 110mm tee piece because I needed to accomodate a stub stack 
upstream of the WC with an AAV in the room. Using a straight pan connector 
into the tee piece meant the WC and cistern didn`t fit flush with the wall 
anymore. To get round this was a b*stard job of chiselling out the wall to 
half sink the 110mm pipework into the wall such that the WC would sit back 
against the wall again.
Using a 90 degree pan connector would prevent this but I couldn`t see a way 
of joining to the T piece without sitting the WC on a platform or lowering 
the whole section of pipe into the floor and chopping out huge chunks in the 
joists.

Steve