this is where a shower drain connected to the house plumbing. i believe this is a brass tee? someone glued threaded ABS into the tee, and then the ABS cracked and was leaking at the threads....the ABS pipe broke off in the tee but the threads are still glued. How can I get this broken of stub of threads out of the tee? I'm not sure what the gray cement is they used, or how toget this out?