The Model 447 regulators are designed to deliver high gas flows from piping systems that are equipped with standard pipe connection outlets or with station regulator connections. The 447 also has a brass bonnet and gauge. -- Heavy-Duty, High Flow -- Pressure Regulation: 1.6 PSIG/100 PSIG -- Gauges: 2.5" Brass -- One-piece encapsulated seat design with internal filter and PTFE Teflon® seat. Low pressure models feature neoprene seats(NC). -- 7 Year Warranty -- Made in the USA -- -- Brass bonnet and gauge -- -- CGA E-4