1. You are right assuming that the nipple will probably crush.
2. To suggest a repair like you suggested is not a good idea and can lead to a serious disaster.
3. I hope that your repairs in your apartments won't get you in a liability suit.

There is a union there so no new union is needed. What erikhaan needs is a qualified plumber who can also re-do the floor after he finishes.


Call at least 3 plumbers. This is not a very big job, but it has to be done correctly.