The Dynarex Resp-O2 Oxygen Humidifier Connector is designed to attach a dry humidifier bottle or pre-filled bubble humidifier to continuous flow oxygen concentrators. Dynarex Resp-O2 Oxygen Humidifier Connectors come with either sturdy oxygen tubing on one end and a male threaded grip elbow on the other end, or with star lumen oxygen tubing on one end and molded threaded straight connector on the other end. Oxygen Humidifier Connectors are universal and can fit most humidifier bottles with a DISS connection.