Abstract: A double valve construction selectively provides a full flush or a partial flush from the tank of a toilet. The apparatus, which may be utilized to modify existing toilet water closets, includes a hollow cylinder with a first valve on its lower end engageable with a first valve seat on an upper end of an outlet from the tank. The upper end of the cylinder defines a second valve seat and a second valve is engageable with the second valve seat. As an operating handle is selectively moved through a first range of travel, it disengages the second valve from the second valve seat for a partial flush and as the operating handle is moved through a second range of travel, it disengages the first valve from the first valve seat for a full flush. The volume of water utilized in a full flush is adjustable, and a mechanism is provided for holding the first valve in its open position until a full flush has been achieved.

Abstract: A double valve construction selectively provides a full flush or a partial flush from the tank of a toilet. The apparatus, which may be utilized to modify existing toilet water closets, includes a manifold mounted on the tank in communication with an outlet for draining water from the tank. The manifold includes a pair of valve seats, one located proximate to the bottom of the tank and one located distant from the bottom of the tank. An actuating mechanism selectively operates a pair of valves associated with the valve seats and is so arranged that when an operating handle is turned in one direction, it disengages the upper valve from the upper valve seat for a partial flush and when the operating handle is moved in the opposite direction, it disengages the lower valve from the lower valve seat for a full flush.