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A pressure flow sensor from Grainger helps determine air pressure in your HVAC system. Use differential pressure flow sensors with VAV controllers and 3/8” O.D. polyethylene tubing. Install them easily through a 7/8” dia. hole in ductwork. A passive static pressure probe senses pressure as air flow aspirates across the probe tip opening. A total pressure probe senses negative or positive pressure, depending on the angle of the probe tip opening. Choose from pressure sensing probes in a variety of sizes and configurations when you shop for a pressure flow sensor at Grainger. Shop today!