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Switching the tank from o2 to co2 will require a change in the fitting atop the tank. This means you will have to, at least, get an adapter for the regulator you have, as o2 regulators don't fit co2 tanks. Ask at the place where you get your tank done what CGA fitting will go on and then get an adapter to go with the regulator you have to ensure a mate for it.
 
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