Flame King ACR6a 2-Stage Auto Changeover LP Propane Gas Regulator for RVs, Vans, and Trailers (Without Pigtails)

Allows removal of an empty cylinder for refill without interrupting the propane supply, For RVs with dual propane tanks; automatically switches from primary to reserve tank when the primary is empty, UL LISTED: Inlets are 1/4" SAE inverted flare and the outlet is 3/8" NPT female pipe thread; rated for 345,200 BTU, Double-stage design maintains constant gas pressure under changing demand and conditions; regulator is factory set at 11WC (water column), Compatible with Flame King's 48-inch Thermo Plastic Hose, item 100383-48, and 12-18 inch Pigtails - E12INPT, E15INPT or E18INPT