These are pics of a drum that I made for somebody a few years ago:
It's sort of a hybrid between the hero/background props shown above since I don't have the lip around the end of the center barrel.
The main barrel on my replica is an automotive fuel filter from Kragen... well actually two of them. Only one end had the cone shape so I had to cut them in half and put the two ends together. The hero prop is somewhat larger in diameter than mine, but it's about right for the background one.
The middle step-down with the ridges is cast from a vintage WD 40 cap. You can see the red color coming through the paint in the photos in the Star Wars Chronicles. I believe the vintage WD 40 cap is the correct part for this piece.
The nut on the end is one of the few decently accurate parts that I've ever found at a regular hardware store. I just can't remember which one. It might have been Home Depot actually which would be even more remarkable. The piece I found is brass and had to be painted.
The wire/tubing is automotive fuel line which is in step with the filter usage. I think what I have there is 1/16" too thick, but it matched the inside diameter on the nut part. Maybe we could find a smaller nut part on McMaster or something. I think 3/16" would be more accurate. I think I have 1/4" shown there.
Adam