Abstract: A portable hand holdable apparatus is provided for use in carbonating beverages. The apparatus includes a valve housing having an inlet section adapted to be coupled in a fluid tight engagement with a source or pressurized carbon dioxide and an outlet section adapted to be coupled in fluid tight engagement with a container having beverage therein to be carbonated. A valve structure is mounted within the housing intermediate the inlet section and the outlet section. The inlet section carries a gas release mechanism for cooperating with a source of pressurized carbon dioxide to release carbon dioxide so as to flow into the valve structure. The valve structure includes a first valve for passing carbon dioxide from the inlet section together with a pressure regulator mechanism that responds to the pressure within the outlet section reaching a given level and then blocking further passage of carbon dioxide through the valve structure.