Marshall Excelsior MEGR-253 Automatic Changeover Regulator 2-Stage, Vertical MountPropane Regulator; Excela Flo; 1 4 Inch Inverter Flare X 3 8 Inch FPT; Two Stage; 225000 BTU I Stage 150000 BTU II Stage; Without Hose; Zinc Powder Coated; Zinc Die Casted; Internal Relief Spring Loaded Diaphragm Type; Vertical Mount The automatic changeover regulator automatically redirects LP gas vapor flow from an empty service cylinder to a reserve cylinder, without interruption of service. It features an easy to read green indicator which changes