Economical & Inexpensive to purchase - The National 3A-B Torch is a time-tested classic Flameworker's torch. The 3A-B has a rotating Leak-Proof union of the tip & elbow assembly, allowing the torch tip to be rotated to any desired angle without the aid of a wrench. This way, flame can be easily & comfortably directed, manually. National's 3A-B Torch is designed for use with Natural Gas, Propane, or Hydrogen. Can be used with Oxygen or compressed Air. Torch works well with low pressure fuel gas at .25 psi. When air or oxygen is added, torch operates at 20 psi or more.