1.You can install your 1/4" inverted torch inlet regulator into a 20lb-40lb LP tank (not a 1/4" male NPT). 2.The pigtail hose can also be used to connect to an installed 4-Port Tee as an auxiliary propane supply 3.Perfects for BBQ, RV and camping needs or having an outdoor cookout 4.High quality solid brass fittings-provides secure, airtight connection propane equipments 5.Installs quickly and easily tool-less attachment to propane tanks and regulator GASSAF 12" tailpipe propane hose connector is designed to connect a propane gas cylinder to an RV or trailer propane regulator, which has an ACME nut x 1/4" inverted male torch. It has solid brass fittings and is 4 feet long and is rated at 200,000 BTU per hour. Safety features include thermal protection in the event of a fire and excessive flow protection in the event of a failed gas line. You can use a 20 lb. or 30 lb. tailpipe that can be filled with a propane tank and connect it to a regulator or 4-port brass tee. It can also be used to connect an installed 4-way tee as an auxiliary propane supply.