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...
Suction Release Devices. U.S. Consumer Product Safety Commission (CPSC) staff is working to develop strategies to reduce deaths and injuries from entrapment in the suction drains of swimming pools and spas.