Doug,
Guessing that you are looking for a short-fuse temporary solution to the failed plug.
I would suggest if you can't readily replace it with a new metal compression plug, pull out the failed plug (you should be able to hook it and pry it out) and then replace it with a temporary
freeze plug like this one available from your local FLAPS.
Just get a basic diameter measurement and go to your nearest FLAPS and pick one up. These are frequently kept in stock just for situations like this.
As noted on the plug, make sure it and the surrounding surfaces are dry when installing for it to work as designed.
Dan
