OK getting this plastic male adaptor out is turning out to be a b-i-t-c-h.
I found a tool at Home Depot *supposedly* just for this job. But like the other tool I tried, I had a hard time inserting it far enough to get a good bite. It bumps up against the seat of the freezeless hydrant. But I got enough of a bite to seemingly back out the broken male adaptor. It has a cam that expands as you back it out. No go. The special tool won't stay in line with the pipe, and it wants to wander to the size as I try to unscrew it. Some of the damage at the edge of the pipe was actually caused by that tool. I got enough bite on it to leave serrations on the inside of the plastic fitting-- but it still would not budge.
I tried heating the pipe. I didn't use a torch because the freezeless hydrant seat looks to be rubber. So I used a propane Mr. Heater and set the fitting above it. And turned it once or twice to heat it all around. Still, nothing would back out the plastic male adaptor. I tried turning by hand, using the tool, and the tried and true chisel and a hammer. I'm pretty sure the fitting was glued in. I can also see some teflon tape sticking out on the far side of the threads.
I was able to pry the plastic fitting from the side-- making sure to pry away from the threads. That successfully broke a small piece out. That's as far as I got.
I don't want to create (more) damage so I will have to try again tomorrow .... it is seated in there TIGHT!