John this one is 3 inch, my newest is 4 inch but I used a 4 inch to 3 inch y so as to keep the opening smaller to keep them from raking out the feed. I plan on doing a similar design in my first chicken tractor but use some angles to make it refillable from the outside.
OK, thanks for that. I have been using 4 inch also but with a screw on end cap at the end of the Y that I cut the top half out of so as the feed cannot spill out of it, but I was of the opinion that 4 inch was too small for their heads and so I was looking at 6 inch but the costs escalate quickly using 6 inch.
Yes I also had a couple of bends on the top end so as it could be filled from outside. I had also thought about putting in a see through window at the bottom of the PVC so I could see food levels.
Cheers,
John