What size thread on CO2 valve

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Im just wanting to know what type of thread the output of the valve is on a co2 welding bottle over in the US. I'm in australia and i want to use a US regulator on a aussie welding bottle which has a type 30 thread.Can anyone help me out.
Reply:without going to the books I think co2 is CGA 320.  Will go if you get no answer.  JohnSMAW,GMAW,FCAW,GTAW,SAW,PAC/PAW/OFCand Shielding Gases.  There all here. :
Reply:Thanks for the reply. Now to try and find an adapter for US CGA 320 to Aussie type 30 thread. Where would i look??