Nortel Minor Bench Burner Lampworking Torch This torch make more efficient use of oxygen, making for a hotter flame with the same resources. Specs.: Surface mix, 7 port. Natural Gas and Oxygen or Propane and Oxygen (bottled or concentrator). Cleaning & Maintenance. Cleaning the tubes with a fine needle tool (included with the torch) is all that is required. Use: For lampworking beads, small sculpture, marbles, from small up to 3 inches. Primarily for use with soft glass and some borosilicate Runs well on a single concentrator, but will happily produce a larger, hotter flame with two concentrators.