Next by Danco HFL190 HydroForce Premium Adjustable Flapper 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 GPF flappers Includes a stainless steel chain