PROJECT SOLVED! Pics added at end of thread.
If worse comes to worse, I will use a rubber Fernco Cupler. My OCD says to try and remove the original fitting first.
I'm replacing the kitchen drain plumbing and I had to cut out the vent pipe. I will be replacing all of the drain piping from kitchen sink to sewer line - plus adding a cleanout. The original galvanized section (not shown) was rusted out and leaking.
The 45 degree elbow is not moving. I used WD40 and soaked for a couple of days, I tapped with a hammer to "wake up" the fitting, I used a torch on it but it is not budging.
Anyone with advice? See photos below.
