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Bert H said:
Switching the tank from o2 to co2 will require a change in the fitting atop the tank.
Bert is correct. Many gases use specialized threading on both the regulator and tank shut-off to assure that gases don't get mixed up and then surprise a user. If you can find adaptors or change the threading you might make it work but if not I think you will need a CO2 threaded tank and regulator. As Bert suggested, go to a welding or gas supply store and ask.
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