The HydroFit total premium toilet repair kit combines the HydroClean fill valve and the HydroForce flapper to make the most efficient toilet repair kit for you. The HydroClean fill valve detects leaks and cleans the tank and the HydroForce adjustable flapper fits more toilets than any other adjustable flapper. It is designed to be compatible with Watersense leaders Kohler, American Standard and Briggs. The HydroFit toilet repair kit repairs and works in more toilets than any other repair kit.