Brand Name: Camco *Product Type: Propane Double Stage Auto-Changeover Regulator *Material: Metal *Color Family: Multicolor *Allows removal of empty cylinder for refill without interrupting propane supply *Inlets are 1/4" SAE inverted flareand outlet is 3/8" NPT female pipe thread *For RVs with dual propane tanks.  *Automatically switches from primary to reserve tank when primary is empty  *Double stage design maintains constant gas pressure under changing demand and conditions *Discovery ACC