This kind of fittings copy norgren structure, it's easy to insert and pull out of the tube. It has a better function than plastic fitting

XHNotion Pneumatic can offer a series of pneumatic fittings, including brass pneumatic fitting, pneumatic tube fittings, air fittings, air tube fitting, air fitting, pneumatic push in fittings, one touch tube fittings, push in fittings, plastic push in fittings, metal push in fittings, air tube fittings, pipe fittings, brass connector, air brake fittings, brass pipe fitting, hose fitting, tube fitting, pipe fitting, compression fitting, brass fitting, metal push in fitting, brass push in fitting, quick connect fittings D. O. T fittings, compact pneumatic fittings, miniature fittings, rapid screw fittings, compression fittings, hand valve, stop fittings, check valve, plastic fitting, plastic tube fitting, air hose fittings, plastic pipe fitting, plastic tubing fitting, and equivalents of SMC, FESTO, LEGRIS, CAMOZZI, NORGREN, Johnguest, METALWORKS, PARKER pneumatic fittings, trailer connector, truck connector, truck accessory, brass connector, socket, plug, quick coupling, quick adapter, quick adaptor, quick coupler, air hose coupler, air hose coupling, rapid fitting, super rapid fitting, air connector, air coupling, water fitting, drinking machine fitting, water purifier fitting, speed fitting, hand valve, speed controller.