There are two pictures here of a toilet drain pipe. I need to replace the tee joint - it is cracked. Is the best place to cut it where I mark the arrows? Should the riser pipe going up to the toilet flange be 3 or 4 inches? If it is 4" the flange fits inside the pipe instead of being pushed down on the outside and blocked by cured concrete or should i leave room for this and use 3" riser again? The previous toilet flange was never fastened to the floor. Whenever the toilet moved however little - the riser pipe and everything else moved also.
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