There are foot pedals with what are called a bypass valve for the outer flame. This allows a little bit of O2to always be put to the outer flame (no propane). If you were going to use the outer flame on a concentrator I would think you would want to use a bypass one. You can adjust how much O2 is always released to the outer flame. (Keep in mind that this O2 will effect the oxidizing/reducing nature of the inner flame)... I use a foot pedal and it's like having a third hand. Good luck.
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Running a Mirage
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