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The 43-pound backpack is an adaptation of the standard Petrogen system. A smaller gasoline tank, aluminum oxygen cylinder, add regulator, quick disconnects, wrench, glasses and gloves makeup a completely self-contained cutting unit designed to cut 25 minutes of 1/4-inch steel or 5 minutes of 4-inch steel. The 1.5 quarts of gasoline will cut steel for 1.5 hours.