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...
inflation therapy - therapy in which water or oxygen or a drug is introduced into the respiratory tract with inhaled air. electromotive drug administration, EMDA, ionic medication, iontophoresis, iontotherapy - therapy that uses a local electric current to introduce the ions of a medicine into the tissues.