Here’s the situation: I have a toilet in my basement, with the flange set directly into the concrete floor. Said toilet is riddled with cracks, and I don’t need a toilet at that location anyway. So I want to pull said toilet out, and seal up the pipe. This toilet is located between the street and the main stack of the house, so I’m guessing that it’s sited directly over a stub rising vertically from the main outflow pipe. Of course, everything is under concrete, so I can’t exactly see. In any event, the pipes will be cast iron of some vintage.
So how is this situation typically handled?