One other thing about refilling tanks is that pushing in that last 500 psi can take as much effort as pushing the first 1000 psi so if you really want to "Rage The Torch" often you may be better off getting two tanks and tying them together.
You will wind up with twice the volume of oxygen at 1000 psi for probably less than half the energy compress one tank to 1500 psi.
Much more efficient.
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The Zombie Apocalypse is Upon Us.
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