e have different kinds of pneumatic connectors, PU tubing, air silencers, pressure gauges, air guns, Pneumatic fittings, push in fittings, Push To Connect Fittings, Air Fittings, Push to Connect Tube Fittings,etc.Pneumatics pneumatic fittings series is of all the specification, including PT Thread Push To Connet Fittings,  PT thread Air Fittings and (G) thread Pneumatic Fittings, Inch size (O.D) push tube and Metric size (O.D) push tube. The structure is various, including from straight Push To Connect Tube fittings, tee fitting, Air Flow control Valve.