Baby Bottles

I want the attachment between the vacuum and the shell to be easily to come apart.  The way I thought to do this was with threaded pieces.  I have used coke bottles and nebulizers to do it so far but I wanted to look into other options.  Coke bottles are more available than nebulizers, but nebulizers work better.  My new solution is baby bottles.  The baby bottles worked fairly well but didn't attach well with my vacuum hose.

 

The baby bottle next to an assembled attachment

 

 The unassembled attachment

-Annie