Jeffy3 wrote:
While replacing the flapper valve in our American Standard toilet
(probably 20 something years old) the overflow tube broke right off at
the bottom. It appears that it was screwed in but that the threaded
end is still stuck in the bottom. Any advise on what to do? It would
seem that if I could just get the threaded piece out I could get a new
overflow tube and screw it in. Thanks in advance.

You can replace the entire thing if you take the tank off the bowl.
Brass is way better than plastic.

Use a sawzall to cut the bolts attaching tank to bowl, those bolts will
be rusted frozen in place