1.Fleetness install, simple and clever, space saving. 2.Pattern variety, meet any needs in installation of pneumatic Tubes. 3.Plastic Tubes can be turned freely after installation. 4.The release button adopted with the oval design, take down more labor-saving and conveniently. 5.All cone tube threads covered with Teflon airproof gum have high sealed performance. 6.With internal hexagon thread , all straight fittings of YPC type are easy to be installed in narrow positions.