The Excela-Flo Model MEGR-253H 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 to red when the service cylinder needs to be refilled. The MEGR-253H Series regulator meets UL, RVIA, and NFPA requirements.• Type: Two Stage• Max Inlet Pressure: 250 PSI• Inlet Connection: 1/4" Female Inverted Flare• Outlet Connection: 3/8" FNPT• Exterior Finish: Raw Zinc / Powder Coat• Diaphragm: Fabric Reinforced Molded with O-Ring Bonnet / Body Seal• Diaphragm Type: Internal Relief, Spring Loaded• Bonnet/Body Material: Die-Cast Zinc• Listings: UL listed 144• Mounting Holes: 3-1/2" On Center• Pressure Taps: 1/8" FNPT Plugged 1/4"" female inverted flare inlet / 3/8"" FNPT outlet 250 PSI max inlet pressure Meets UL, RVIA, & NFPA requirements | Camping World Excela-Flo MEGR-253H High-Capacity Automatic Changeover Regulator in Red