Sleepmate 11 AirSense 11 This is a humidifier water chamber for CPAP machines. Please make sure it is for the above models. Essential for the coming season to combat dryness. Used for a short period & cleaned. We handle items in good condition. We will inform you of any defects as much as possible, but there may be oversights. Please check the condition in the photos. Please consider purchasing, understanding that this is a used item. #Resmed #ResMed #philips #Philips #SleepApneaSyndrome #Apnea #Snoring #CPAP