This version of the Model 351 is designed for cylinder applications. Its unique design makes it more resistant to CO2 freeze up than comparable competitive models. The Model 351 is zero-compensated for more efficient gas use. -- Heavy-Duty -- Pressure Regulation: N/A -- Gauges: 50mm ABS -- One-piece encapsulated seat design with internal filter and PTFE Teflon® seat. -- 7 Year Warranty -- Made in the USA -- -- Brass body -- Gas-shielded arc welding and other industrial applications -- CGA E-4