Abstract: A pressurizing cap which may be readily attached and detached from the discharge neck of a bottle of carbonated liquid includes a housing having a first chamber proximate one end thereof and a skirt portion at an opposite end thereof which engages the bottle's neck. The first chamber retains a pressurized canister of innoxious gas such as carbon dioxide. The housing also comprises a second chamber. A first conduit leads from the first chamber to the second chamber, and a second conduit leads from the second chamber to the neck portion of the bottle. Means are provided within the second chamber for selectively connecting the first and second conduits whereby gas is released into the bottle. Liquid discharge means may also be provided which comprises a nozzle extending from the housing and a tube coupled at one end thereof to the nozzle and having an opposite end in communication with the liquid in the bottle. The cap is collinearaly mounted with the neck of the bottle.