Air is let through the regulator: Listen & Download Air is let through the regulator .mp3 Error! Change your browser, please! ⇓ Download Oxygen balloon ⚠ Air release with a loud whistling creak, ⚠ Air is blown through a glass tube ⚠ Helium balloon ⚠ A stream of air breaks out of a metal pipe ⚠ Small compressor blowing air ⚠ Air flow ⚠ Air pressure ⚠ Construction, compressor discharges air ⚠ Wind tunnel ventilation ⚠ Soccer ball ⚠ Rope torsion ⚠ ★★★★★