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...
There are various types of cupping therapy, including: 1  Dry cupping (suction only). 2  Wet cupping (combination of suction and controlled medicinal bleeding).upporters of cupping therapy believe the suction of the cups mobilizes blood flow to promote the healing of a broad range of medical ailments. Recommended Related to Mind, Body, Spirit.