Propane adapter tee with a male P.O.L. and female P.O.L. by male Type 1 (QCC-1) adpater to install in line on your motorhome or RV. It also has 1" x 20 disposable cylinder male adapter for additional appliance hook up. It has a female inverted flare fitting that allows you to hook up a spare cylinder to supply the coach or RV. You will need a pigtail with 1/4" inverted male end x P.O.L. or Type-1 (QCC-1) end to hook up the spare cylinder. We recommend Mr. Heater part #71144 in the length you desire or Mr Heater part #71158 in your desired length. If you're hooking up to a 100 lb cylinder you need to go with a #71144 series pigtail!