Step 2Let the Water In
Notice how one (or both) of the two plugs for the barrel have threads in the middle of it. As it turns out, these threads can be used to connect our water source to the barrel. All that is necessary is to drill out the bottom of the threaded hole using a 3/4" drill bit. It is also possible to use a utility knife to cut out the bottom of this hole (be careful not to damage the threads!).
Now, screw the adapter into the plug. Be sure to put the plug back in the barrel and tighten it before you screw the adapter into the plug. The plug is much easier to tighten into the barrel when the adapter is not installed. This is a good time to make sure the other plug is tightened as well.
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