Auto-Changeover Two Stage Propane Regulator Is Most Commonly Used On Rvs With Dual Tank Hook-Up. The Enerco Two-Stage Auto-Changeover Regulator Provides Easy Changeover From Empty To Full Cylinder While Providing Adequate Fuel To Your Rv.; ; 400,000 Btu Max Flow ; 2-1/4 In. Inverted Female Flare Inlets X 3/8 In. Female Pipe Outlet ; Propane Level Indicator Located On Top Of Regulator ; Csa Certified ;