Fluidmaster 2 in. Universal Chlorine Resistant Flapper is made of durable thermoplastic materials designed to withstand harsh water conditions without rotting, outperforming vinyl or rubber s. This easy-to-install flapper fits most toilet tanks and now features built-in Microban technology, which helps reduce the breakdown caused by bacteria, ensuring longer-lasting performance. It comes with a 5-year manufacturer's warranty and serves as the equipment for Fluidmaster kit Model No. 200C, 400CRP14, and 555CRP8. The flapper measures 2 inches, is red in color, and is packaged individually on a card for convenience. Model Number: 501P21