Glassactcc,
It is used to control the outer flame. It is used when a torch has 2 flame rings and 4 hose connections (four studs). It turns the outer ring off and on thus saving having to twist the knobs saving time and oxygen. I find about a 10 percent savings with my work style. My torch has 3 flame rings so my foot pedal has 4 solenoids and 2 switches and the plumbing is a bit more complicated. Usually the inner or center flame is left on and is plumbed direct.
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