The Model 447 is a special pipeline flow control device designed to deliver shielding gases more economically than other flow control devices, thus eliminates wasteful surge . Available models for MIG and TIG. -- Heavy-Duty -- Pressure Regulation: N/A -- Gauges: 2" Steel -- One-piece encapsulated seat design with internal filter and PTFE Teflon® seat. -- 7 Year Warranty -- Made in the USA -- -- -- Gas-shielded welding -- UL® listed; CGA E-4