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Airgas on Old Dowd Road near the airport will test them
12 to 15 monthsHow long ago was that? Last time I was up there they would only exchange Co2 bottles, nothing else.
Not sure where local is but I'm guessing Charlotte so I'm not much help but Pye Barker in Garner (outside Raleigh) can test them.
My SCUBA tanks take the same testing and some of the local shops take them there for hydro testing. Maybe call around to local commercial fire extinguisher places. They can add air after the test but not sure about anything else.