Quiet and powerful toilet fill valve. Works with all toilets, including Kohler, Toto, and American Standard. Maximize toilet performance and save water. Universal fit, perfect for: HET (high efficiency toilets) 1.28 GPF (gallons per flush), dual flush, including Duo Flush, 1.6 gal (gallon) toilets with 2" and 3" flush valves (1994 and newer), older high gallon toilets with 2" flush valve (1994 and older). 2 times greater refill rate than standard fill valves. Avoids excessive or inadequate bowl fill level. Quick and easy installation. 7 year warranty.