CGA 626 should be a Nitric Oxide Pressure Regulator this iteam should be stainless and for the part stamped 318L? i only know of 318 stainless and it come in pipe. 318 stainless is close to a 304 stainless. If there is a 318L stainless the L- at the end would stand for low carbon. I hope this helps you out a bit )
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