The Whisper Swivel II Exhalation Port is for use with certain Respironics masks that do not come supplied with a swivel.

The Whisper Swivel II, like it's predecessor, allows exhaled air to exit at the mask end of the system.

This is only to be used with Reusable Silicone Contour, Gold Seal and older Profile Lite masks from Respironics that do not come with a swivel. It is not to be used with any other mask.