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...
Cupping therapy is a form of alternative medicine in which cups are placed on the skin to create suction.The cups can be made of a variety of materials, including: 1  Glass. 2  Bamboo. 3  Earthenware.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.