These regulators are new old stock and have never been used. I also have many other cutting and welding torches, tools and equipment listed if you are interested. Please feel free to ask any questions you may have and thanks for looking!!! The item "SMITH REGULATOR SET H1710A-540 Oxygen H1721A-510 Acetylene Cutting Welding Torch" is in sale since Thursday, September 3, 2020.This item is in the category "Business & Industrial\CNC, Metalworking & Manufacturing\Welding & Soldering Equipment\Welding Equipment & Accessories\Welders, Cutters & Torches\Gas Welding Torches". The seller is "bulldog_equipment" and is located in Colbert, Georgia. This item can be shipped to United States.