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 to red when the service cylinder needs to be refilled. Meets UL, RVIA and NFPA requirements. Type: Two StageMax Inlet Pressure: 250 PSIInlet Connection: 1/4" Female Inverted FlareOutlet Connection: 3/8" FNPTExterior Finish: Raw Zinc / Powder CoatDiaphragm: Fabric Reinforced Molded with O-Ring Bonnet / Body SealDiaphragm Type: Internal Relief - Spring LoadedBonnet/ Body Material: Die Cast ZincListings: UL LISTED / UL 144Mounting Holes: 3-1/2" On CenterPressure Taps: 1/8" FNPT Plugged