The Camco 20-Inch Pigtail Propane Hose Connector is designed to connect a propane cylinder to an RV or trailer propane regulator. It has an ACME nut x ¼-inch inverted male flare. It is rated for 200,000 BTUs per hour. Safety features include thermal protection in case of fire and excess flow protection in case of a broken gas line. You can use the pigtail hose with a 20 lb. or 30 lb. refillable propane cylinder and connect it to a regulator.