(3B34) THE 3M AMBIENT AIR PUMP 8050501, A LOW PRESSURE PUMP, INCLUDES A SOUND REDUCING CHAMBER, PRESSURE GAUGE AND AN ADJUSTABLE PRESSURE RELIEF VALVE. IT CAN BE USED TO DELIVER AIR - SIMILAR TO HIGH PRESSURE - TO THE WORKER. IT IS AN ECONOMICAL SOLUTION TO CERTAIN SITUATIONS WHEN SUPPLIED AIR RESPIRATORY PROTECTION IS NEEDED.