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Shop oxy-fuel flashback arrestors and check valves at WeldersHelper.com, including regulator-mounted and torch-mounted safety devices from trusted brands like Victor FlameBuster, Harris 88-5 series, Western Enterprises, and Smith Equipment-designed to protect against reverse gas flow and dangerous flashbacks. Flashback arrestors combine a flame arresting element with a built-in non-return (check) valve to stop flames and pressure shock from traveling back into hoses or cylinders, while standalone check valves allow gas to flow in one direction only-working together to ensure safe, controlled operation across cutting, welding, and heating applications.