some people choose to run the inner fire off oxycon(s) and tanked for the outer fire to save $$ on O2 refills. I just set my new torch up this way, so I don't have any idea how long my 280 cf tank will last. I also like this concept as it will allow me to work even when my tank is empty just using the oxycons (it's good for patience building anyway).
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Elizabeth
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