This is a replacement CPAP nasal cannula interface for the Nasal-Aire II CPAP mask from DeVilbiss. This CPAP cannula interface is ergonomically designed to fit any face with virtually no leaks. This CPAP cannula interface also features ultra-soft nasal prong material that greatly improves comfort. This CPAP cannula interface should be washed after each use, and is good for roughly 90 washings. This means the cannula should be replaced roughly every 3 months to maintain optimum performance.