I bought a CO2 version SWP to use on a pub gas bottle.
It's now a year old and works fine.
I always use a flow meter added on as it gives a spot on gas flow reading "at a glance" and possibly saves gas.
might be stating the obvious but they are both argon not co2 unless you buy a adapter thats if you are using pub gas
paulg's picture is of a Co2 one for pub gas