2-Stage Propane Tank Regulator with 2 Pigtail Hoses Dont run out of propane gas with this convenient regulator, ideal for RVs with dual propane tanks. Hooks up 2 propane tanks to your RV at once so youll always have a fuel supply. Auto-changeover feature automatically switches from the empty propane tank to the full tank for a continuous gas flow. Lets you remove empty propane cylinder without interrupting propane supply. Includes 2 12-inch pigtail hoses.