Before revision: 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 Diver 's air pump supplies air to a diver for breathing or other uses.
After revision: 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 diver 's air pump supplies air to a diver for breathing or other uses.