Abstract: There is provided a post-mix drink dispenser of a novel design which permits higher carbonation and faster flow of materials than the existing dispensers. The dispenser includes a pressure equalizing nozzle for dispensing carbonated water, and a suitable syrup distributor. The syrup and carbonated water are permitted to mix when a first stem valve is moved to a prescribed position. The first stem valve is moved in conjunction with a flexible diaphragm. The diaphragm is maintained in a first position by a pressure differential of carbonated water pressure on opposite sides thereof such that no mixing or dispensing occurs. The diaphragm flexes to a second position when the carbonated water achieves different pressure states on opposite side of the diaphragm. The different pressure states are controlled by a second stem valve. The second stem valve controls the states of a pressure bleed path as a function of the position of a mechanical lever means which is operated by the user of the dispenser.