Let me start out by saying that ALL of these parts can be bought at Lowes for a little over 50.00
They sell a 5' section of 4" PVC pipe so you don't need to buy a full length.
As you can tell from the pictures you need a clean out on one end and a cap on the other.
I started out by drilling a 1/2" hole in the cap and installing the 1/2" eye bolt with a Ny-Lock nut on the inside with a 1/2" fender washer. Do not tighten this nut up, have it to where the eye bolt will rotate, but not flop around.
You should be able to tell from the picture that I had to spread the eye bolt open to get the swivel in it. I then added a spot weld just to make sure the hogs didn't pull it apart. I also added a little paint on it for rust.
The chain is 3' long with a ring on the end for the 3/4" pipe to go through that you drive in the ground that it pivots on. Make sure the pipe you drive in the ground has something on top of it to where they cant lift the end of the chain up over the top of the pipe. The hogs will push this thing around in a big circle, so make sure there is nothing in the way.
I then drilled five 1/2' elongated holes to let the corn out as they rolled it around. Two on one side, and three 180 degrees on the other side.
I didn't want to drill to many , the purpose of the pipe is to try and feed them just a little and not a full 50lb bad in one night.
Another trick you can do is to add some rocks to the inside to make them think that there is corn still in there. The other one I made is in the field. It might take them a week to figure out how to get the corn out of it, so be patient..........
(All pictures are copyrighted)