•Purchase is for 1 Adapter Only Propane Tank Refill Adaptor •Female throwaway cylinder thread x Soft Nose P.O.L •For personal use only •Refills 1 lb. bottles in 1 minute or less so quick •Works with all 20, 30, or 40 Pound 50,Cylinders •With this adapter you are not able to overfill the smaller bottles it will only put in the tank as much as it can hold, you are also able to back fill into larger tank if you got in a situation where your larger tank runs dry •Hook up the smaller cylinder with this adapter and it will equalize the pressure between the two tanks. Save hundreds of dollars •Great for Ice Fishermen, mountain men Outdoorsmen, and all Campers and power outagesUSA