RV Propane Gas Regulator 2-Stage Auto Changeover

RV Propane Gas Regulator 2-Stage Auto Changeover. LP Tank Dual Hookup (Without Pigtail Harness). Unused, approximately 6 1/4" by 3 7/8" by 3 1/2" and is for use on RVs or trailers with dual propane tanks. The function of this regulator is to automatically switch from the primary LP tank to the reserve tank when the primary tank is empty, allowing for the removal of the empty propane cylinder without interrupting the propane supply.