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CO2 Tank Pressure

    I just got a 20# CO2 bottle (full) and an O2 regulator for it.  By the 
"dummy" lines on the regulator, I am below 1/3 full.  I figure this is 
erroneous because CO2 must compress at a different pressure than O2.  Does 
anyone know what the tank pressure should be at for a full 20# CO2 cylinder?