MJSI Inc HFL190 HydroForce Premium Adjustable Toilet Flapper Unique for their full range of adjustability, HydroForce flappers accurately fit more toilets than any other flappers sold. These leak resistant, easily adjusted, water-saving products take the guesswork out of choosing the right flapper. A study conducted in 2004 for the California Urban Water Conservation Council showed that a 1.6 gal. toilet mistakenly fit with a 3.5 gal. flapper can use as much as 4.4 gallons with every flush. HydroForce flappers are made of high-quality materials that can withstand the extreme water conditions and harsh chemicals that warp tank components and cause leaks. MJSI Inc HFL190 HydroForce Premium Adjustable Toilet Flapper Features: Replaces all 1.6 and 3.5 flappers Fully adjustable for water savings Works in every size tank Premium rubber material Corrosion and chlorine resistant Silicone sprayed for extra protection Manufacturer 5 year warranty