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An air line is a tube, or hose, that carries a compressed air supply. In industry this may be used to inflate tyres or power tools worked by compressed air or to operate other pneumatic systems, or for breathing apparatus in hazardous environments. Air line is also used for supplying compressed air in road vehicle air brake or railway air brake systems on larger vehicles or railway carriages or locomotives, and air lines are used in underwater diving where a compressor or a hand-powered air pump supplies air to a diver for breathing or other uses.

The most common sizes of air tubing are one quarter inch and three eights inch outside diameter tubing, although a wide range of tubing in both standard and metric sizes is available.