Korky, Ultra 2X Flapper, Long Lasting, Universal 2" Flapper, Proprietary Chlorazone II Rubber Formulation Lasts 2 Times Longer, Hold Ups In The Harshest Environments, Flexible Red Rubber Resists Chlorine, Bacteria, City Water Treatment, Hard Water, & Well Water, Eliminates Water Waste By Decreasing The Amount Of Water Flushed, Ideal For All Standard 2" Toilets, Including: 1.28, 1.6, 3.5 & 5 Gallons Per Flush, Adjustable Flapper Has Multiple Settings, Fits Models: American Standard Cadet #'s 4029, 4078, 4083, 4053 & 4650, Monarch #4003, Mainstream #4061, Evolution 2 Flowise #4061, Kohler Wellworth #K-4620 & K-4519, Toto #706, & Many More, Tight Seal & Easy To Install, Includes: 1 Adjustable Flapper, 1 Instructions & 1 Stainless Steel Chain, 10 Year Warranty.