... for plastic tubes, banjo pneumatic fittings, etc.Pneumatic Pipe FittingsTube OD: 04, 05, 06, 08, 10 ... 1/4, 3/8, 1/2 inchConnections: M5, G1/8, G1/4, G3/8, G1/2, R1/8, R1/4, R3 ... and it's thermostable. In addition, these pipe fittings meets repeated insertion and pull-out requirement ... .Adaptability: Hot and cold water systems, steam, machine tool, lathe suchas application if corrosive environment SP ...