Fluidmaster 504 2-Inch Universal Chlorine Resistant, Long Lasting Flexible Frame Toilet Flapper Universal design fits most toilets, including American Standard actuator units  for 3.5 gallons per flush toilets or larger Fits on flush valves with or without mounting ears Chlorine-resistant with Microban protection Strong, kink-free metal chain 5-year warranty Pre-1994 Full Flush flapper Universal design fits most toilets, including American Standard actuator units Note: This product is designed to fit toilets with 2 flush valves Pre-1994 Full Flush flapper Universal design fits most toilets, including American Standard actuator units Fits on flush valves with or without mounting ears Five year warranty