Abstract: An automatic flush apparatus for converting a manual flush toilet to an automatic flush toilet, and including a sensor for being mounted on an exterior wall of a tank of the toilet for detecting a condition predetermined to initiate a flush operation of the toilet. A signal transmitter conveys a signal indicating the occurrence of the condition, and a motor is provided for being positioned in the tank for receiving an electric current indicative of the condition from the signal transmitter. A flush valve is positioned proximate a bottom wall of the tank and is operatively connected to the motor for being opened by the motor upon receipt by the motor of the electric current.