The Korky Ultra High-Performance Flapper 3 Pack is the most universal standard 2-in. flapper available. The flapper adjusts to match the 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 Gal. per flush gpf. The exclusive longest-lasting red rubber resists chlorine, bacteria, city water treatment, hard water, and well water. Recommended by the Clorox help line, this Corky flapper is proven longest lasting. The adjustable flapper has multiple settings to ensure it fits popular standard 2-in. toilet models: Standard Cadet 4029, 4078, 4083, 4053, 4650, Monarch 4003, Mainstream 4061, Evolution 2 Flowise 4061, Kohler Wellworth K-4620, Wellworth K-4519 and TOTO 706. Made of flexible rubber for a tight seal and easy to install, the 100P3 includes: (3) 100BP Flappers and (3) Stainless Steel Chains.