DANCO Hydro-Force Adjustable Toilet Tank Flapper, 2-inch, Blue, 1-Pack (HFL190) Silicone rubber construction is corrosion resistant in harsh water conditions Float adjusts easily to help save water and includes a stainless Steel chain Float can nest in the flapper to help maximize flush Great range of water level adjustability Replaces 2 in. 1.6 and 3.5 gph flappers