The Intermittent Suction Unit provides the versatility of an intermittent mode for nasogastric drainage and a continuous mode for tracheal, pharyngeal, or surgical suctioning. The Intermittent Suction Unit (ISU) with mode selection for intermittent, off and continuous suction. Intermittent mode utilizes a pneumatic logic device to cycle the unit automatically, returning the system to atmosphere in the "OFF" cycle and from 0 to Full Vac in the "ON" cycle. Timing cycles are independently adjustable from 3 to 30 seconds. Intermittent flow rate is adjustable from 0 to 13 Lpm, preset at 8 Lpm. Both mode selector and vacuum regular controls are lockable. The regulator module and gauge assembly are interchangeable with the Continuous Vacuum Regulator. Dual Modes - intermittent and continuous Quiet, reliable operation Dependable, time tested gauge and controls Provides Full Vac regulation Low Maintenance, easy to service Low cost replacement parts and kits