Ah, okay. I wasn't sure if it was supposed to be like that or just sloppy finishing work. I'll get out the old dremel, grind it down, and try to get a good seal on it.
Update: I got a better seal on the smaller-to-larger hose connection, filed down the flash, and put on a better clamp. That did the trick! I'd still like a better connection rather than just shoving a smaller hose into a larger one, but I have other things to deal with...