A propane tank or canister is usually a low-pressure gas Cylinder made of welded steel. An instance of a welded steel is when two half-cylinder sheets of steel are welded together with the addition of a foot and neck ring. The welded steel help insulate propane against fire. The Low gas pressure regulator on your Fire Disc cooker is designed to adapt to a 16.4 oz green propane tank and 20-pound propane tank around 4 feet.