Humidifier Bottle 125cc Upper Water Level is used to provide humidified oxygen to patients in hospital or at home to prevent damaging the respiratory tract. Oxygen Humidifier Bottle has a female adaptor that fastens to the oxygen concentrator where the therapeutic oxygen exits the machine and is pumped through the bottle. The Humidifier Bottle is filled halfway with sterile water that creates a vapor mist the exits the bottle along with the oxygen to the patient. ME7512 Humidifier Bottle has water level of 125cc upper.