Flashback arrestors used with oxyacetylene equipment are installed in:

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A flashback arrestor’s job is to stop a flame from traveling back into the gas supply. Installing it at the regulator places a protective barrier right where high-pressure gas from the cylinder could be driven back by a flashback, protecting the regulator and cylinder from damage or ignition. If the arrestor were only in one line or placed elsewhere, a flashback could still travel back through the other path or reach the regulator and cylinder. So placing the arrestor at the regulator provides essential protection for the system.