I used 1/2" pvc. I Drilled a 3/4 hole, outer hole needed to be reamed it a lil bigger and the inner lining of the pipe was a little thinner so I just hammered the pvc through. The pipe fit surprisingly snug. I'm not sure how im gonna secure them in place yet, I have a few ideas. They still have 1/2 acre left to dig so I'll decide how and where I'll place them. I'll post pics when I get to that point.
