This device threads into a DIN 300 valve on a 4500psi rated SCBA cylinder. Thread the DIN 300 fitting into the valve on the SCBA tank, connect the Foster Fittings Female Quick Disconnect to the cylinder on your gun, make sure the vent knob is closed on the black block device, open the valve on the SCBA bottle and proceed to fill. Once you have topped off your air cylinder, close the valve on the SCBA cylinder, open the vent knob to bleed the air out of the lines, and then disconnect from your airguns cylinder.
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