Used in oxy-fuel welding and cutting systems. It is designed to prevent flashbacks, which occur when a flame travels back into the gas supply line, potentially causing explosions or damage. The arrestor allows gas to flow in the correct direction while blocking reverse flow and extinguishing flames if a flashback occurs. The label on the device provides specifications such as maximum pressure (0.15 MPa), flow rate, and thread size (M16x1.5), indicating compatibility with specific systems.