The Uni-flo2 Single Nasal Cannula is a single nasal and single sided low flow oxygen cannula that can be worn by patients during sleep.Designed to conform to all facial contours, reduce skin contact, and address the discomfort of wearing a dual-prong cannula, Uni-flo2 is interchangeable to either nostril. According to the manufacturer, the Uni-flo2 eliminates dual prong cannula discomfort from the tubing pressing into the cheek, pulling on the ears, and noosing under the chin during sleep.