An oxygen generating device (18) is described which comprises a container (23) having a mouth and a neck surrounding the mouth, and a tank (17) with an annual flange for establishing a gas tight seal between the tank and neck. Furthermore, a dome assembly (13) is engageable with the neck and extends upwardly to define a dome chamber above the neck. A means (20) exists for permitting oxygen generated in the tank (17) to flow into the dome chamber by bubbling through a liquid contained in the dome base. The dome base (62) has an outlet connection through which oxygen can leave the chamber and where at least part of the dome is transparent so as to render the inside thereof visible from the outside of the dome (66).
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