Their are two people posting or different names
claiming to be the same person here.... what is that all about??
If this passed a while back, their is probably good
reason that they never tore into any more of that clay
tile or terra cotta that they absolutely had to....
you will have to increase the size of the hole probably a
foot wider at least and because
the wye is probably 4 inches longer than the tee..
two things you will need...
gloves up to the elbow ..and probably a sump pump
to help pump out the sewage water while you do
this major operation.....
if it passed a while back...
leave sleeping dogs lie...
god help you if you split or break that tile