Fits most 3-inch flush valves in newer HET toilets and is compatible with brands like American Standard, Aquasource, Crane, Eljer, Ferguson, Gerber, Glacier Bay, Jacuzzi, Mansfield, Pegasus, TOTO, and many more! Does NOT fit Kohler Toilets Fits specific 2-piece toilets made since the year 2000 with large 3-inch flush valve openings, excluding Kohler. Overflow tube height easily adjusts from 7 inches to 11-1/2 inches - no hacksawing required