Fluidmaster, Replacement Flush Valve Seal For Kohler Aqua Piston & American Standard Champion 3 Toilets, Quick & Easy Way To Eliminate Leaks On Your Specialty Flush Valve Toilet, Designed To Be A Direct OEM Replacement For A Perfect Fit & Secure Seal, Built To Last, Silicone Seal Lasts Up To 10X Longer, Chlorine & Hard Water Resistant.