... product line of pneumatic fittings contain the metal push-in fittings rapid pneumatic fittings, rapid pneumatic ... fittings for plastic tubes, banjo pneumatic fittings, etc.Push-Lock FittingsTube OD: 04, 05, 06, 08, ... (GP Series)Tightness Ring: Brass (GP Series)Push-In fittings with different shape, only one hand ... can be very convenient to insert the tube and pull out without any ...