Manufacturer Name: Sensus-Gas Division Product Number: 143-IRV-1 OEM Part Number: 143-IRV-1 The Sensus-Gas Division 143-IRV-1 is a gas pressure regulator designed to operate safely and efficiently in a variety of home and commercial HVAC applications. To operate, it automatically lowers the supply line's high-pressure gas pressure to a constant, lower pressure that is appropriate... https://www.partshnc.com/143-irv-1-sensus-gas-division-1-irv38-orifgreen-6-14-wc