Based on others I’ve seen built, I created this with 3″ ABS pipe. I already had most of the materials, except the cap and threaded plug, which I bought for under $5 at the Habitat for Humanity Restore. The

I will most likely replace the threaded plug with a cap to help with water proofing. For the bottom I chose an end cap with a removable pipe clamp so it could be easily cleaned.

Installation:
I chose to install the feeder underneath the coop (within the pen) to help keep the food dry and away from deer and other critters. I mounted the feeder on the back side of the coop using a 2×2 and a couple of screws. Underneath, I used a block of redwood 2×4 to brace it for stability. The chickens took right to it.

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Automatic Chicken Feeder (installed under coop within run)

Future:
I’m going to take the advice of a client/friend who built the same type and install some sort of rope or chain (maybe both) to float down the interior of the pipe to: a) help keep the feed moving, if clogged and b) help keep things dry. (rope should absorb moisture) I’m also going to build out a simple retainer for the feeder with a chain and latch so I can easily remove it.

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