1. We will make a connector that uses 2 elbows and 3 pieces of 1/2" irrigation pipe:
2. Press the irrigation pipe into the elbows:
3. Connect a top and bottom barrel together.
4. WARNING - a barrel full of water weighs over 400 lbs! Be sure to make the bottom barrel level and make sure the top barrel is leveled on top of the bottom barrel. You do not want the top barrel to fall on anyone (especially kids who might play on the barrels)! If your bottom barrel does not provide a stable platform for the upper barrel, you can make a wooden table top to set on the bottom barrel so that the top barrel will not fall over.