This project is great if your a camper or into survival. The basis of this project is to save you money by refilling your old empty 1 lb propane tanks using a common 20 lb propane tank. The main thing to be able to do is an adapter that you can find online and purchase very easily.
Step 1: Supplies:
All you will need for this is multiple 1 lb empty propane tanks
20 gallon propane tank
20 lb to 1 lb adapter
cinder block to elevate 20 lb tank
fridge to cool 1 lb tanks
Step 2: Filling the 1 Lb Tanks:
Refilling the 1 pound propane tanks is pretty straight forward. First off safety is the most important thing. Make sure when refilling you are outside and that there are no open flames when doing it. The best way to fill them is to put the 1 lb tanks in the fridge to get them cold. This will help the propane fill better. Screw in the adapter to the 20 lb tank. The threading on theses are opposite to normal. I used cinder blocks to prop up the tank so that you can reach under and turn on the 20 lb tanks. Screw in the 1lb tank into the 20 lb tank in the up right position.then flip the connected tanks over onto the concrete slabs. Now all you need to do is turn on the 20 lb tank all the way and let the 1 lb tank fill up. You will hear the tank filling. Wait until you don't hear the filling turn off the 20 lb tank flip over to right side up and unscrew the 1 lb tank.