A respiratory interface system for use in delivering a flow of a positive pressure breathing gas to an airway of a patient includes a patient interface device. The patient interface device includes a tubing assembly for positioning on the head of the patient, a mask having a sealing element for sealingly engaging about the airway of the patient, and an adaptor. The mask is coupled to the tubing assembly via the adaptor, and the tubing assembly, the mask, and the adapter define a pathway for conducting the flow of the positive pressure breathing gas to the airway of the patient.