The many specialty flush valves in the market make it difficult to identify exactly which specialty valve you have. Our PerforMAX Kohler and American Standard Seal Kit solves for the 2 most popular tower flush toilets in the market. This kit includes the Fluidmaster PerforMAX Fill Valve which is the quietest and most powerful fill valve on the market. It also includes 2 flush valve seals which can repair the Kohler AquaPiston flush valve or the American Standard Champion 4 flush valve. Fluidmaster PerforMAX Toilet Fill Valve and flush valve seal kit lets you easily fix and upgrade your Kohler or American Standard toilet.