You will have to buy a new toilet as far as I know. Sloan makes a valve
that uses water pressure and it works well. Available in Gerber, Kohler and
Crane toilets and probably others. Gerber version is very quiet but get a
tall one because it has a very high water level that bothers some people.
Nice think is that sloan valve requires almost no maintenance and they can
detect back pressure and instantly stop flushing if they sense a problem.
Overflows almost impossible. I have 4 in my house. They are older Kohlers
and relatively noisy. My parents have 2 Gerbers that are very quiet.
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