Fluidmaster PerforMAX Valve Seal Kit Black Plastic (Pack of 5)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