The see through mask seals tightly to the patient’s face, ensuring correct ventilation,and enables providers to view patient lip color, secretion and fogging from exhalation.The elbow between mask and ventilation bag swivels 360 degrees, so users can providecare from any angle.The ergonomic construction provides an excellent feel of lung compliance and helpsavoid excessive ventilation that could damage the lungs.For supplemental oxygen from an external source, The BAG II includes a ClosedSystem Oxygen Reservoir with Universal Star- Lumen Oxygen Tubing to connect tothe oxygen source. This allows providers to administer 98-100% O2 concentration.here is no need for an adapter between tubing and flow meter, the tube fits directly.