A neighbor has a tank that he wants to dispose of and I am thinking of just asking it from him. The poblem is that he is not sure as to what gas is inside the tank. i know its an aluminum tank and needs an inspection done as it is expied. My question is: is a CO2 tank a special tank or is any pressurized tank the same? Same for the fitting, do I need a special one to be able to connect a regulator on it?