The Fits Cadet 3" Toilet Tank Flapper replaces American Standard Cadet 3" flapper: 738920-0070P and the Pegasus Colonnade flapper. Featuring an oversized design, the exclusive longest lasting red rubber resists chlorine, bacteria, city water treatment, hard water, and well water. The Cadet Flapper works with the following American Standard Cadet 3 toilet models: 2403, 2568, 2907, 4000, 4007, 4019, 4021, 4027, and 4202. Made of flexible rubber for a tight seal and easy to install, the 3040 includes: (1) Large 3" Flapper and (1) Stainless Steel Chain.