So I got the 2.5" cylinder from LeLuv. Good quality and fits the LA Pump hose perfectly.
However, I should have gotten the 2.25 instead. What's happening is it is sucking up the skin around my penis before starting to expand the penis, so it very weird. Can't return it, so I am debating making a sort of flat donut gasket from rubber, with a 2.25" hole, and using silicone to attach to the bottom of the tube. This should let me use the tube fine and, if my penis gets thick enough, I'll just remove the "donut" or make the hole bigger. That's my idea, anyway.