The Korky Ultra 2X Flapper is the longest lasting, most universal 2 In. flapper available. The proprietary Chlorazone II rubber formulation lasts two times longer than other flappers and is backed by a 10 year warranty to hold up in the harshest environments. Korky red rubber resists chlorine, bacteria, city water treatment, hard water, and well water. The flapper adjusts to match original toilet settings and eliminates water waste by decreasing the amount of water flushed. Ideal for all standard 2 In. toilets, including: 1.28, 1.6, 3.5 and 5 gallons per flush (gpf). The adjustable flapper has multiple settings to ensure it fits popular 2 In. toilet models: American Standard Cadet (4029, 4078, 4083, 4053, 4650), Monarch (4003), Mainstream (4061), Evolution 2 Flowise (4061), Kohler Wellworth (K-4620, K-4519), TOTO (706), and many more. Made of flexible rubber for a tight seal and easy to install, the 2017 includes: (1) Adjustable Flapper, (1) Instructions and (1) Stainless Steel Chain.