Respironics Mask Swivel Adapter fits ComfortGel Nasal, ComfortGel Blue, ComfortSelect, ComfortFusion, ComfortClassic, Profile Lite and FitLife CPAP masks and is used to connect two CPAP hoses together. The 360 Degree rotation prevents extended hoses from kinking or pulling on the CPAP mask elbow.The Mask Swivel will also work with a tubing quick-connect to add even more freedom of movement to your CPAP hose.