What sort of tubbing is good to use for running the air assist on

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1

What sort of tubbing is good to use for running the air assist on to the carriage

2

This is what I used, very flexible.

3

I used clear vinyl tubing from lowes, you can buy it by the foot very cheap.
http://lowes.com - https://www.lowes.com/search?searchTerm=clear+tubing
https://www.lowes.com/pd/EASTMAN-3-8-in-x-20-ft-PVC-Clear-Vinyl-Tubing/1000180543