We tried 2" pipe and it wouldn't feed so we built one out of a 3" pipe like the ones at the following links. Yours seems like it would be more efficient with the elbow though. The bottom of our Y is filled with food they can not reach or eat. Someone also added a gauge to see how much feed is inside which I thought was a neat addition but it may allow water inside the tube if it is left outside.
Mine is 4 inch standard waste pipe with a y at the bottom. I inserted a poece op pipe at the bottom of the y with a piece of metal on top so all the feed is forced to go to the angled part of the y.
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We tried 2" pipe and it wouldn't feed so we built one out of a 3" pipe like the ones at the following links. Yours seems like it would be more efficient with the elbow though. The bottom of our Y is filled with food they can not reach or eat. Someone also added a gauge to see how much feed is inside which I thought was a neat addition but it may allow water inside the tube if it is left outside.
http://www.instructables.com/id/PVC-Chicken-Feeder/
http://www.instructables.com/id/PVC-Chicken-Feeder-with-Meter/
5 inches would be too heavy for our chicken tractor.
I'm planning on upgrading to 3 inch pipe and use a y adapter on the bottom like Errol mentioned.