Image Number 2 for United States Patent #6651264.
A flush valve is connectable to a blind hole in a vertical wall of a toilet tank. An overflow member is in fluid communication with a flush valve housing. The flush valve housing is wider than it is higher, and fits into a blind hole in the tank wall of similar cross sectional shape. The tank is formed with an attachment ear. A clip mounted on the housing holds the housing against the tank wall, while the non-circular nature of the housing and blind hole prevent relative rotation there between.