Hi all

As the subject really. Is there any reason why I shouldn't pipe an overflow
from the side of a cistern down and under said cistern and tee into flush
pipe?
If so, is there a reducing tee type fitting that would take 22mm overflow
pipe into the side of 38mm flush pipe?
The current overflow goes into a room soon to be a kitchen (hopefully).
I want to keep the existing cistern, box it in and fit a back to wall pan.
This way I have one toilet in the house that gives a decent flush volume
(unlike the flush three times 6Litre models currently on the market).


TIA

Phil