Ray,
The pipe is for watering and keeping the potting soil moist in the EB. A few inches from the bottom of the container is a separator with supports , it keep potting mix apart from the water in the bottom of the container, but the separator sits on a pot like container that holds potting mix that serves as a wick which draws water to the upper potting mix.
Hell, it hard to explain. LOL
Do a Google on "homemade earth box"
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