The Maxitrol 325-7A-1 is a 1-1/2-inch lever-operated gas pressure regulator intended for precision control in a variety of HVAC applications. It has a strong design with a positive dead-end lock-up mechanism, which ensures steady gas pressure even when downstream demand is zero. It can adapt to a variety of applications thanks to its maximum inlet pressure of 5 psi and adjustable outl... https://www.partshnc.com/325-7a-1-maxitrol-14--1-14--gas-pressure-regulator-1250000-btu-use-with-r8110-series-spring-c