Oxygen generator humidifier cup adapter tube for connecting oxygen concentrator to humidifier. One end of the humidifier cup adapter tube is provided with a threaded nut for easy placing in the humidifier bottle. Replacement for the old or broken one, can fit directly, reliable and durable to use. The oxygen humidifier adapter black plastic without tubing is a detachable plastic device that connects an oxygen delivery system, such as a oxygen concentrator or oxygen tank, to a humidification chamber without the need for additional tubing. This adapter is made of durable plastic and is designed to be lightweight and compact for easy use and transport.