This Montague 01040-5 is a 1/2" LP gas pressure regulator designed for use with low-pressure gas appliances. It maintains a consistent downstream pressure of 5.5 to 12 inches of water column (WC) with an inlet pressure of 1/2 pound per square inch (PSI). https://partsfe.com/01040-5-montague-pressure-regulator-12-lp