Description Kohler 2.25 inch Toilet Repair Kit | One-Piece Toilets Flush Valve: 2.25 inch flush valve with 10.5 inch tall overflow tube. Fill Valve: 7/8 inch fill valve adjustable from 8-12 inches tall. Flapper: The durable hardbody flapper valve is designed for one piece toilets with 2 inch flush holes Easy Installation: Installation hardware included for install in many common brands.