a manual and automatic flusher includes an infrared sensor added to a conventional manual flusher , and the infrared sensor consists of an electronic eye and an electro - magnetic valve . the electro - magnetic valve has an iron core moved in and out for controlling opening and shutting of a block , and a communicating tube connected between a flow hole of the block and the upper end of a valve body to enable a hand rod and the infrared sensor separately operated by means of the flexibility of the communicating tube , not interfering with each other . then the flusher can be used by a manual operation or by automatic operation , with a simple structure for manufacturing .