a portable soft drink dispenser that can be attached to a conventional beverage container and maintain the carbonation of the beverage . the dispenser includes a housing with an internal thread that can be mated with the external thread of a conventional beverage container . attached to the housing is a removable co 2 cartridge which can supply co 2 to the beverage container . the flow of co 2 into the container is controlled by a regulator valve that is coupled to a button by a spring . the pressure within the beverage container can be varied by manually pushing the button .