Universal Rigid Frame Chemical Resistant Toilet FlapperFix the most common cause of toilet tank leaks with a Fluidmaster Rigid Frame Chemical-Resistant Flapper. The rigid frame helps the flapper align on the flush valve seat for a more consistent flush. Made from a special chemical-resistant material, this flapper will survive even the harshest water conditions. The flapper also includes a kink-free chain that prevents hang-ups, and will fit any 2" flapper flush valve. Fluidmaster 501CT Features: Pre 1994 full flush flapper Material engineered to resist chlorine Universal fit, works on most toilets Rigid frame aligns, the flapper and seals the drain seat every time Fit any 2" flapper flush valve Kink free chain Fluidmaster 501CT Specifications: Length: 2.725"Width: 6.125"Height: 6.125"Product Weight: 0.238 lb. Fluidmaster was founded in 1957, and continues to grow thanks to innovation and a commitment to the customer.