This Whisper Swivel is used to remove excess waste gasses from some older Respironics CPAP/BiPAP masks. It should only be used on Reusable Silicone Contour Masks, Gold Seal Masks, and some older ProfileLite Masks that did not come with a swivel.
This Whisper Cap snaps on to the existing Air Intake Port on the back of all M-Series CPAP and BiPAP systems. In tests the Whisper Cap reduced overall sound levels by 3dB, on average. Sound measured 18.2dB at 5cm and 25.3dB at 10cm pressure levels.