The Ralston QTFT-2MB1 1/4" Male NPT x Male Quick-test Fitting with Check Valve, Cap and Chain connects to pressure transmitters, EFMs, flow computers and other NPT devices under test, using thread sealant for a permanent connection. The removable cap provides easy access to connect a Quick-test hose to the process for calibration purposes and is easily sealed bubble-tight again when calibration is complete. The included cap and chain furthermore make calibration easy and quick by connecting and disconnecting a hose without a wrench or thread sealant.