[Greg Peshek]

Reminds me of the inside of our ball collector with the ends of pneumatic tubing (or some other tubing), glued into the PVC. I would imagine this would be the inside of the tube with the cut off ends of the tubing barely sticking into the inside of the PVC so you can fit a shaft through the middle. That could be off, but it looks a lot like the ball collector I was just making.

-Greg