I tried to unscrew a 1 1/2 inch pipe from a cast iron tee in the wall. It is a drain connection for a bathroom sink. The galvanized pipe was old and rusted and broke off inside the cast iron tee. How do I get the rest of the rusted galvanized pipe out of the cast iron tee?

When that happens to me I take a small sharp chisel and work it under the broken thread. Once under the thread you can began to pry the threads up and peel them out. Good luck, Tom