You want a gas regulator, ss diaphragm, low pressure gauge between 0-200. If you can find one with 0-100 that's even better. Stay away from acetylene and corrosive gases regulators. If the corrosive gas regulator is new, then it's fine.
Chances are you won't find one with a needle valve on it, and if you do it won't be the kind we need. Dual stage regulators have a bump in the back, single stage are usually flat.
You'll also need a cga inlet and nut. The cga code will tell you what gas the regulator was made for. You can change out most of them for a co2 inlet/nut which is cga 320.
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