CO2 tanks have to be tested to 3000 psi. Helium tanks have a range of ratings from 1800-2400 psi. Look for DOT3A on the tank, the four digits after that will give you the rating.
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Remember one unassailable statistic, as explained by the late, great George Carlin: "Just think of how stupid the average person is, and then realize half of them are even stupider!"
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