Korky, 3", large easyfix flush valve repair kit, repairs corrosion or deposits on plastic & brass flush valve seats & corroded flush valve seats without removing your toilet tank, engineered materials resist chlorine, bacteria, city water treatment, hard water, & well water, universal design, fits oversized 3" flush valves found in newer 1.6 & 1.28 gpf toilets since 2005, multiple settings, for use with kohler, toto, american standard, gerber & mansfield, silicone seals within 15 minutes, making installation quick & easy, made of flexible rubber for a tight seal, includes: 1 large flapper, 1 stainless steel chain, 3 plastic flush valve seats & 1 tube of silicone sealant.