The Maxitrol R500Z-3/4 is a 3/4-inch pressure regulator designed for systems with a maximum inlet pressure of 1 pound per square inch (PSI). It functions as a "zero governor," meaning it maintains a nearly constant outlet pressure regardless of fluctuations in flow rate. This regulator is suitable for use with natural gas, manufactured gas, and air. It's a reliable component for ensur... https://www.partshnc.com/r500z-34-maxitrol-gas-regulator-with-zero-governor-up-to-1-psi-includes-1-3--spring