A patient interface device (2) includes a coupling (4) structured to receive and distribute a flow of breathing gas (100), and a nasal component (6) extending outwardly from the coupling. The nasal component includes a single sealing element (8) structured to engage and seal only one of the two nostrils (306, 308) of a nose(304) of a patient(300). A method of fitting the patient interface device includes receiving the aforementioned patient interface device, and engaging and sealing a single nostril of the patients nose with the single sealing element.
