The Whisper Swivel II is an external exhalation valve with a reusable design that allows for proper ventilation of exhaled waste gas in older models of Respironics masks. While modern masks typically have exhalation ports built into the mask's design, this required component ensured that previous Philips Respironics masks had a continuous leak path in the breathing circuit to get rid of exhaled air. The Whisper Swivel II device is compatible with the following Philips Respironics masks: Silicone Contour Gold Seal Profile Lite The Whisper Swivel II is an exhalation device that quiets your night by directing exhaled air out and away from your mask, while also dampening the sound of the exiting air. The swivel feature ensures the active exhalation valve rotates with the CPAP hose to prevent kinks. Cleaning / Maintenance Tips Cleaning Tips: Disconnect the Whisper Swivel II from your mask and CPAP tubing. Disassemble the Whisper Swivel II by pressing the two tabs atop the swivel connection together and separating the parts. The Whisper Swivel II should be hand washed in warm water with a mild soap. Rinse with warm water and allow to dry out of direct sunlight before reassembling. 332113