Nortel Mid-Range Torch with Minor TopA larger torch with a flame up to 1 inch across. Larger, hotter, faster. Specs.: Natural Gas and Oxygen or Propane and Oxygen (bottled or concentrators requires 3 concentrators for optimum performance.). Cleaning & Maintenance. Cleaning the tubes with a fine needle tool (included with the torch) is all that is required. Use: For Large soft glass work or borosilicate. Fitted with a top mounted Minor torch.