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I would use a large pipe wrench and w-40. If that doesn't work then I'd cut it out and fold the threads on itself
That's not what you want unless you want to remove it completely
There is no liner so you might want to remove it all
This would require jackhammering around it and cutting the vertical pipe just below it
No. the whole thing has to come out.
Gotta put this in
Let me ask you this. Are you putting in a shower or is this going to be used as a floor drain?
Showers should be 2" the whole way and vented.