1.Designed in compliance with CSA,ASSE and UPC, and pass the JC707-1997 standard testing. 2.Water working level remains the same, although water pressure is changing. 3.Anti-siphon, non-corrosion as well as silent flush function. 4.Water working level is adjustable with adjusting float cup height. 5.Momentary shut-off water function. 6.One-piece float cup design, saving space, suitable for all kinds of toilet tanks.