Maxitrol RV53-1 is a 1-inch straight-thru-flow gas pressure regulator designed to deliver stable outlet pressure from 3 to 6 inches W.C. with a maximum inlet pressure of 1/2 PSI. The regulator works by modulating an internal diaphragm and valve to automatically balance gas flow and maintain consistent pressure to the appliance. It is widely used in commercial furnaces, boilers, roofto... https://www.partshnc.com/rv53-1-maxitrol-1-csa-reg-12maxin-3-6-out