QUICK installation simple and flexible,space-saving The tube fitting comes in a wide variety of models to meet all your needs in pneumatic piping. Even after installation,the direction of tubing can be changed freely. The release ring adopts the ellipse design to make it more convenient and labor saving for disconnection. All taper pipe threads are pre-coated with Teflon with fine seal performance. All fitting are equipped with the internal hexagonal holes.It is easy for them to be mounted in the narrow places