On Thursday, January 1, 2015 8:35:20 AM UTC-5, David Martel wrote:
Deo,

Sorry but I can't understand your problem. You have a stub coming out of
the wall. Copper? PVC? The stub attaches to a threaded fitting and/or a
valve. The cut-off valve attaches to a pipe or hose. Is this pipe or hose
screwed into the valve (compression fittings)or soldered? Your pipe or hose
is screwed into the flush valve.
Basically you want to put a T-piece between the cut-off valve and the
flush valve. If you have a hose then buy a t-piece and another hose.

As I understand it, he's saying that the end of the toilet supply line is
directly attached to the valve coming out of the wall. I haven't seen one
like that, but it's possible. So, the tee that was supplied, he can't use.
He wants another tee that would go on the other end of the supply line,
between the supply line and the end of the toilet ballcock/fill assembly.
He actually said he wanted it to connect to the "tank", which I'm assuming
means the toilet tank, hence the above.
I've never seen such a widget, which he describes as 7/8", and that sounds
about right. In his latest post, he's apparently found one on Amazon.

I hadn't thought about it until now, but this bidet thing is then going
to be spraying you with cold water. I would think it would have to attach
to something that can mix hot and cold, adjust, etc and you sure don't,
have that at the typical toilet.

..