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...
Known as photopneumatic therapy (PPX), the new approach combines pulsed light treatment with skin suctioning using a vacuum device. Munavalli tells WebMD that the suctioning helps clean clogged pores and intensifies the effects of the light treatment by bringing oil glands closer to the skinâs surface.