If you have a 3 inch flapper the Korky 3" Universal Toilet Tank Flapper is adjustable to match your original toilet's performance. It has a universal design and will fit oversize 3" flush valves found in newer 1.6 and 1.28 gpf toilets. The long lasting red rubber resists chlorine, bacteria, city water treatment, hard water, and well water. The adjustable flapper has multiple settings to fit popular 3" toilet models including: Kohler, TOTO, American Standard, Gerber and Mansfield. Check out more home improvement tips in our e-books https://www.amazon.com/gp/product/B0B2KW1FQ9?notRedirectToSDP=1&.