I got mine built last week and wound up using a large apple juice bottle. The bottle with the cap still on puts snugly in the 2" pipe. So I cut the top to the cap off, so that it acts as a threaded sleeve within the 2" pipe. The vac got a real good test tonite. As I was pouring the pellets in, I spilled about 1/8 of a bag all over my shed floor. The floor is filthy - sawdust, dirt, pine needles, etc. I swept the mess up, and poured it thru the vac, needles and all. They came out out clean as can be. One tip I have - Move the bucket that the cleaned pellets go into out from under the vac before turning the vac off. Alot of little pieces fall out from the screen when the suction is gone and will go into your cleaned pellets if not.