Air is let through the regulator:
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Truck Air Brakes
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Oxygen balloon
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A stream of air breaks out of a metal pipe
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Air compressor operation
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Wind tunnel ventilation
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Air broom, Blower
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Air pressure
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Air release with a loud whistling creak,
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Construction, compressor discharges air
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Cylinder pressure, air bleed, Air compressor
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Inflating a mattress
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Soccer ball
★★★★★