CO2 meter will not fit 5/8 hose fitting and will not come with adapter as listed. Apparently the adapter required is not a common item, the welder says they've never seen one (they said it's a flow meter used in hospitals, not for welding) and they had to use a short hose with a 9/16 Making internal threads in one go. end and a 5/8 female on the other side to make it usable ($11 but shouldn't have needed it!)