How to inflate an oxygen bag

1. First, fill the oxygen bag with oxygen to make the inflation pressure reach 25 kPa. 2. Connect the rubber catheter with one end of the oxygen inhalation tube with a plug and insert the other end into the nostril. 3. The amount of oxygen can be adjusted by plastic check valve. 4. When the pressure in the bag is too low, some heavy objects can be pressed outside the bag to increase the pressure in the bag.