It is an air gap that allows air to escape rather than building up in the pipe and creating an air hammer within the pipes (banging noise), and problems with drainage. (think about pouring out of a can that doesnt have the second hole punched in it.
Suction Therapy : Suction therapy is provided to assist in the removal of bronchial secretions that cannot be expectorated by the patient spontaneously. Suct...
massage therapy, the manipulation of the soft tissues of the body for the purpose of normalizing them, thereby enhancing health and healing. Massage therapy includes a number of methods, such as acupressure, classical Western massage, and shiatsu.