A flush valve control apparatus selectively operable in a partial flush mode and full flush mode for use with a water closet including a flush drain aperture and a buoyant flapper valve having an air chamber formed therein, the flush valve control apparatus comprises a first and second valve control, the first valve control operatively coupled between the second valve control and the atmosphere includes a first valve actuator movable between a first or closed position and a second or open position and a first valve housing to selectively control the flow of air from the second valve control through the first valve control to the atmosphere, and the second valve control operatively coupled between the first valve control and the buoyant flapper valve includes a second valve actuator movable between a first or open position and a second or closed position and a second valve housing to selectively control the flow of air from the air chamber through the first and second valve controls to the atmosphere to selectively control the action of the buoyant flapper valve to operate in the partial flush mode or the full flush mode.