Mask Cushions and Pillows work to create a seal for airflow into nasal passageways and also to keep the user comfortable. They sit on the face or nose.
Filters protect the components on the inside of the PAP device from dust and other particles which could harm the machine. They also reduce the amount of allergens which are passed through the PAP device.
Tubing brings the air from the machine to your mask, and back out. Without it no air would reach the patient from the machine.
Headgear is worn with the mask attached. This allows the mask to stay on your face through the night. Chin Straps are used when a patient wears a nasal pillow mask by keeping their jaw shut, but still allowing them to vent through their mouth if needed.
The humidifier water chamber holds distilled water for use in the PAP's humidifier. The humidifier allows the air the patient breaths to be a comfortable humidity to prevent dry mouth.