Pneumatic coupling

•  Pneumatic quick couplers (also referred to as air couplers, or pneumatic quick disconnects),  are primarily used for pneumatic applications, connecting air tools, hoses, or other implements to compressed air supplies. 
• The coupler half contains a shut-off valve that is automatically opened when a mating nipple is  inserted and automatically closes when the nipple is removed.  
• Parker pneumatic couplings come in three basic designs: general purpose/manual connect,  general purpose/push-to-connect, and special purpose.  
• The standard seal material for shut-off couplers is Nitrile.