Here is a easy way to have compressed air whenever and wherever you need it. First you will need an air compressor capable of pumping up to 3000 psi(207 bar).
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I use an old MAKO compressor.
Next you will need one or more SCUBA tanks. I have eight.
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Then you will need a yoke and regulator.Click image for larger version. 

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I only fill mine to 2500psi.Click image for larger version. 

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They will last a surprisingly long time and you will always have air when you need it...