a lightweight , portable post - mix carbonated beverage dispenser unit for use in small offices or small - volume locations is described . flavored syrup is supplied to the unit from disposable sealed syrup packages which are plugged into a dispenser valving system . co 2 is supplied to the unit carbonator system in returnable containers which also may be quickly plugged into a co 2 valving system . a thermoelectric refrigeration system may be provided to decrease noise and the number of moving parts or a mechanical freon system may be used . the unit construction may be modular for ease of repair . the cabinet is injection - molded from plastic . water is supplied to the unit for mixing with the co 2 and syrup from a water reservoir which may be manually filled . the refrigeration system cools the water in the reservoir , as well as the syrup packages and carbonator tank .