Fluidmaster 2" Universal Chlorine-Resistant Long Lasting Flapper is expertly engineered to provide durable performance in all water conditions. This toilet flapper features a chlorine-resistant material construction combined with built-in Microban protection, which is uniquely integrated into the flapper to help prevent breakdown and inhibit bacterial growth. Designed for quick and easy installation, its versatile flexible frame fits flush valves with or without mounting ears and is compatible with most 2" brass and plastic flush valves. I for older toilets using 3.5 gallons per flush or more, this flapper helps eliminate water waste and a reliable upgrade for your toilet’s flushing system. Model Number: 504