Intermittent Suction Unit (North American) The North American Intermittent Suction Unit is a combination continuous and intermittent regulator for use with hospital pipeline vacuum systems and 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 adjustable from 3 to 30 seconds. Intermittent flow rate shall be 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. Gauge face has color coded ranges, glow in the dark needle and increments. Dual Modes - intermittent and continuous Quiet, reliable operation Dependable, time tested gauge and controls Provides Full Vac regulation Low maintenance, easy to service Economically packaged replacement parts