Push in fittings with PT & NPT(PUL-union elbow fitting) Thread: Inch thread, Metric thread, NPT, PT, BSPP As a Fitting manufacturer,include pneumatic Fittings, Push in Fittings, Air Fittings, Instant Fittings, One Touch Fittings, Pneumatic Connectors, Quick ... no additional sealing.Various models are available in both inch and metric sizes. Push in fittings with PT & NPT(PUL-union elbow fitting)