Don't hesitate to ask. Ask questions and do a lot of research via google, yahoo, bing etc.These regulators require little maintenance. They contain no user serviceable parts. Do not try to repair them yourself. Any servicing requiring disassembly must be performed by a qualified repair technician. The item "Smith H1710A oxy & H1721A acet gas regulators victor cutting torch compatible" is in sale since Sunday, March 3, 2019. This item is in the category "Business & Industrial\CNC, Metalworking & Manufacturing\Welding & Soldering Equipment\Welding\Gas Regulators, Valves & Accessories". The seller is "torch_services" and is located in Phoenix, Arizona. This item can be shipped to United States.