You can tee off the regulator line and just use a hose with a ball valve to regulate the purge flow. You will have to listen to the flow and adjust the regulator and ball valve. Its not exact, but does save from an dual regulator if it is not something you do regularly. I used this method for Tig welding some stainless exhaust and turbo pipes.
Solar flux works great, but I wouldnt use it inside a gas tank.
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Nate
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71 Nova. "The Green Machine" April 11' PHR
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