How to get a 2" galvanized steel pipe out of a stubborn cast iron fitting?
Here is my current situation:
I am ripping out the old galvanized steel piping and will replace it with PVC, since I have the walls open for the bathroom remodel, which I am working on. I got everything already out with the exception of one little piece of galvanized steel pipe left.
The galvanized steel pipe is a 2" drain pipe leading into the cast iron main stack (4"). The piece that doesn't come out it sitting in a Y fitting. It's sealed with lead. I first just tried to twist it out by using a 24" pipe wrench. That didn't work. Then I tried to chisel out some of the lead and then wanted to wrench it out. I even used a 4' pipe for more leverage on my wrench, but all it does is - nothing. The pipe doesn't move at all. I also tried to just bang it with a hammer to losen the lead, but that didn't get me any further. I think that the people installing it initially either screwed up the threads or it's just so corroded that it's "welded" together.
Now my question is if there is any other way that I can get this pipe out of the fitting other than cutting out the whole cast iron fitting and replacing it with a PVC fitting.
I already thought of just leaving it in and nohub it with the new PVC pipe, but that doesn't work, since I won't get the required slope for the drain (unfortunately, no one cared about codes back in the 50s and that's when the old pipe was put in). Since the piece of pipe is sticking out about 6 inches from the fitting, I also don't think I can just cut it off shorter to try to get the slope and then nohub it.
I do really prefer to get it out of the fitting and then completely replace it with PVC. Any suggestions are very much appreciated.