The Korky Ultra Saver Flapper is the most universal 2 inch flapper available. The flapper adjusts to match original toilet settings and eliminates water waste by decreasing the amount of water flushed. Ideal for all standard 2 inch toilets, including: 4.8, 6, and 13+ litres per flush (lpf). The exclusive longest lasting red rubber resist chlorine, bacteria, city water treatment, hard water, and well water. Recommended by the Clorox help line, this Korky flapper is proven longest lasting. The adjustable flapper has multiple settings to ensure it fits popular 2 inch toilet models: American Standard Cadet (4029, 4078, 4083, 4053, 4650), Monarch (4003), Mainstream (4061), Evolution 2 Flowise (4061), Kohler Well worth (K-4620), Well worth (K-4519), and TOTO (706).