The Norgas Controls and Metering N5B-0750-S-VL0375 Gas Vent Regulator is a self-operating gas pressure regulator designed to maintain consistent outlet pressure in residential, commercial, and industrial gas systems. It regulates incoming gas pressure up to 2 PSI to a controlled 7–11 inches water column range, supporting reliable operation of gas furnaces, boilers, and other gas-fired... https://www.partshnc.com/n5b-0750-s-vl0375-norgas-controls-and-metering-n5b-34-inch-npt-7-11-inch-wc-2-wvent