Anyone know how to get the broken-off male threaded 1/2 inch pipe out of the female threaded end? Male end was corroded and 1/2 inch stuck inside the pipe.
You could use an EasyOut if you can find one large enough. They make an inside pipe wrench, but I think they only work on larger pipe. An EasyOut is basically a lefthanded threaded tapered hardened steel hunk. You put it inside the hole, and then use a wrench to back it out of the wall like a screw.
You can also try a hack saw blade and carefully cut thru the nipple and pry it out with a thin flat screwdriver. Just be careful not to cut thru the female threads.