Abstract: This invention provides a modification kit by means of which a conventional toilet of the flush tank type may be converted into a dual flush system. The mechanism is mounted and secured inside a flush tank on the front wall of the tank and is operationally connected to the flushing lever and the water outlet valve. The invention incorporates a float which may be selectively controlled by the flushing handle on the outside of the tank to permit a vertical float type outlet valve or a flapper type outlet valve to close at a reduced or full flush of the toilet at the discretion of the user. In part this disclosure is an improvement on a previous invention described in full in my patent application Ser. No. 261,303 (Series of 1970).