Performax Toilet Fill Valve, High-Performance, 2.0Performax, 2. 0, high performance toilet fill valve, works with all toilets including kohler, toto & american standard het toilets, 1. 28 gpf, dual flush, 1. 6 gallon toilets with 2" & 3" flush valves & older high gallon toilets with 2" flush valves prior to 1994, 2 times greater refill rate than standard fill valves, water saving bowl water level adjustment lets you regulate fill level in the bowl, saving water & money, anti siphon, code approved,