Pneumatics (from Greek πνεῦμα pneuma "wind, breath") is the branch of engineering that uses gas or compressed air.Pneumatic systems used in industry are usually powered by compressed air or compressed inert gas. A centrally located electric compressor powers cylinders, air motors, pneumatic actuator

Many of these couplings are of the so-called "jaw" type. Some of the information below has been extracted from commercial product catalogs and specifications. [10][11][12][13]King of the Air[edit]"Air King"[14] Universal Air Hose Couplings, also known as "Chicago Style" fittings, are malleable iron