ATL Welding Supply has flashback arrestors for cutting torches and gas regulators. We have name brand and generic arrestors available at terrific pricing. Most all of our flashback arrestors are sold in sets. We do have a few individual ones available. All our flashback arrestors act as reverse flow check valves to stop the reverse flow of gas, also the most common cause of flashback. We only stock flashback arrestors with B-size 9/16-18 thread fittings. A-size are available on special order.