All medical gas piping must be purged with Dry Nitrogen NF while brazing.  This will avoid any Copper Oxide from forming inside of the tubing.   NFPA-99 requires that piping is purged with a regulator/flowmeter, not a regulator alone.  This one has a CGA-580 inlet for your Nitrogen NF cylinder and a threaded outlet for your purge hose.


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