The Korky Plus 2" Toilet Tank Flapper is the #1 selling flapper in the US. The exclusive longest lasting red rubber resists chlorine, bacteria, city water treatment, hard water, and well water. It is recommended by the Clorox help line. Made of flexible rubber for a tight seal and easy to install, the 2001 includes: (1) Premium Flapper and (1) Stainless Steel Chain.