Camco's 20" Pigtail Propane Hose Connector is designed to connect a propane cylinder to an RV or trailer propane regulator. It has an ACME nut x 1/4" 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 tank and connect it to a regulator or 4-Port Brass Tee. It can also be used to connect to an installed 4-Port Tee as an auxiliary propane supply.