A carbonating device for carbonating an opened vessel including an inlet valve for receiving pressurized gas, an exit valve for expelling gas into a vessel to be carbonated, a trigger for opening the inlet valve, a trigger pressure regulator arranged to close the inlet valve, a discharge assembly, and a cap assembly, the discharge assembly coupled to and de-coupled from the cap and including a port for discharging gas to the cap, the discharge port being opened and closed by a valve and a pressure regulator arranged to automatically close the discharge valve in response to a pressure level.