Solid pipe that can be used for stormwater drainage, sewage, etc. It needs a little cleanup as it has been stored in a garage.
It is a really solidly made pipe, in excellent condition, and I don't believe it was ever used. I think it was leftover a couple of years ago by a landscaper. It appears to be a heavy gauge plastic, possibly a high-density PVC.
Measurements are: 7-1/2 feet long x 3-1/2" overall diameter and 3" inside diameter.