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So, here is the deal with those cylinders. They are filled with medical oxygen. Medical, get it? Medical gas is traceable from the point of filling with a serial number denoting the batch it was filled with and tested to be breathing quality. That way you don't get welding oxygen or cutting oxygen or anything except for breathing grade. There are 2 breathing grades, medical and Aviators Breathing grade. Both have batch numbers on them. The only reason this is important is if you actually need it. So, if you need it, and you use it, and the victim die, guess what, everyone's going to court. Someone will ask if the o2 was medical grade. If the answer is no, you just lost the fight.
my advice is to check the local laws, and get the gas at the local Airgas or other gas shop, and get medical O2. A cylinder costs less than 10 bucks. It comes with a cert. yes, I can fill them myself. I don't. Pat of the reason is that even though I own my own cylinders, I don't use enough medical o2 to even use up the tanks before they are due for hydro. If I trade tanks at the gas house, they get the expense of hydro and refill, too.
my advice is to check the local laws, and get the gas at the local Airgas or other gas shop, and get medical O2. A cylinder costs less than 10 bucks. It comes with a cert. yes, I can fill them myself. I don't. Pat of the reason is that even though I own my own cylinders, I don't use enough medical o2 to even use up the tanks before they are due for hydro. If I trade tanks at the gas house, they get the expense of hydro and refill, too.