Side Cover for ResMed AirSense 10™ series is an optional accessory that replaces the humidifier of The AirSense™ 10 and AirCurve™ 10 PAP devices. A perfect solution for individuals who only require humidity for specific seasons or wish to decrease the size of their machine for travel. Using this accessory will disable your humidity setting. Light grey is intended for use with the AirCurve™ 10 and AirSense™ 10 AutoSet™ for Her.