What's the diameter of the pipe? Would like to see it full, I don't quite get how it works.Just finished two gravity feeders, one for oyster and the other for pellets. They're about 3'6" and hold quite a bit. It took some experimenting to figure how long to make the horizontal tube at the base. Too long and the pellets didn't make it to the edge, too short and the pellets were on the floor. I got all the materials from homedepot's garden section and it was considerably cheap, about $12 each. If anyone wants the dimensions, just let me know.