Classification of air hoses and air tubes for supplying compressed air to mechanical equipment. Includes various air hoses made of urethane, nylon, and fluororesin, spiral hoses, reel hoses, hose assemblies with fittings, polyurethane tubes, nylon tubes, and air blow gun hoses. Used as air supply piping for pneumatic cylinders, air tools, and air blow guns, with pressure resistance, flexibility, and wear resistance being important selection factors. Distinguished from pneumatic fittings and couplers as connection components, and clearly differentiated from air filters and regulators in terms of functionality. Essential for air supply in manufacturing line automation equipment, assembly processes, paint booths, and clean rooms.