Push in fittings with PT & NPT(PUC-union straight fitting) Thread: Inch thread, Metric thread, NPT, PT, BSPP As ... steelThread: Inch thread, Metric thread, NPT, PTColor of sleeve: Blue, Red, Black, GrayShape of sleeve: Oval, RoundFunctional One-Touch design facilitates ... metric sizes. Push in fittings with PT & NPT(PUC-union straight fitting)