NPT Male Quick-connect Adapters make calibrating pressure transmitters much easier. Using a unique pressure-assisted seal the Ralston Quick-test male NPT QD adapter saves time and prevents leaks. Connect to any female NPT process connection without using thread tape or a wrench. This has saved technicians countless hours in the field because they do not have to remove residual thread sealant from pressure transmitter ports prior to calibration. Because the seal is made using an o-ring and not thread tape the adapter will seal even in ports which would leak using a standard NPT adapter.