Korky, 1.6", Adjustable, Ultra Water Saver Universal Flapper, Flapper Adjusts To Match Original Toilet Settings & 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, Long Lasting Red Rubber Resists Chlorine, Bacteria, City Water Treatment, Hard Water, & Well Water, Recommended By The Clorox Help Line, Fits American Standard Cadet #4029, 4078, 4083, 4053, 4650, Monarch #4003, Mainstream #4061, Evolution 2 Flowise #4061, Kohler Wellworth #K-4620, Wellworth #K-4519, & Toto #706, Made Of Flexible Rubber For A Tight Seal & Easy To Install, Includes: (1) Adjustable Flapper & (1) Stainless Steel Chain.