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All items are 100% Brand New, High Quality A flashback arrestor or flash arrestor is a gas safety device most commonly used in oxy-fuel welding and cutting to stop the flame or reverse flow of gas back up into the equipment or supply line. It protects the user and equipment from damage or explosions. HEAVY DUTY SOLD PER SET Contains: 1 x Oxygen 1 x Acetylene #flashbackarrestors