Man, yet another trip to J&L.

I swear I'm going to have to forward my mail there.

I'm considering airline control valves, which most LFS's should have - because I'm in Richmond at the moment I'm going to try PJ's Pets (Island Pets didn't have any) as they seem to have a varied assortment of freshwater specific goodies.

I appreciate everyone's suggestions.

PetSmart has them for like $5 for a package of several. They fit in 1/4 inch tubing. I've been using them for years.

I picked one up (which is now petsmart - instead of PJ's) for $5, yes.