i use pneumatic hosing. its super cheap, you can buy as short of a section you want at most hardware stores. something like this:

http://www.mcmaster.com/#standard-plastic-and-rubber-tubing/=uowues

runs under a dollar/foot and a foot is more than you will need.

I use pneumatic hosing, something like this:

http://www.mcmaster.com/#standard-plastic-and-rubber-tubing/=uowues

It's super cheap (runs under a dollar/foot and a foot is more than you will need) and you can buy as short of a section you want at most hardware stores.