A flush mechanism is a system used in toilets to remove waste and refill the bowl with water. When the user presses the flush handle, it activates a valve that releases water from the tank into the bowl, creating a siphoning effect that pulls waste away through the drain. After flushing, the mechanism also refills the tank with water, preparing it for the next use. This process typically involves a float that rises with the water level, signaling the valve to close once the tank is full, ensuring efficient operation for the next flush.