| Hey Stewart,
"The plumber came back and tightened it and all seemed well. It has again worked loose and water is pooring down the back of the rubber seal when a deep bath is run which covers the overflow."
In "Bathtub 101" we learn to fill the tub to just UNDER the overflow, not OVER the overflow. This is learned right along side of "Potty Training" , "Don't Splash On The Floor" and "Rubber Ducky" issues.
You evidently failed "Bathtub 101". I hope you did better with "Potty Training".
To answer your question I would coat the face or the sponge rubber gasket with silicon jell and put lockwashers on the screws and crank everything down tight.
Good luck and watch those rubber duckys. They can turn on you! Tom |