Camco's 20 in pigtail propane hose connector is designed to connect a propane cylinder to an RV or trailer propane regulator. It has a ACME nut x 1/4 in inverted male flare. It is rated for 200,000 Btu per hour. Safety features include thermal protection in case of fire and excess flow protection in case of 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 four port brass tee. It can also be used to connect to an installed four port tee as an auxiliary propane supply.