Bevlex 1/4" ID braided Co2 hose.
Cost per foot.
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Though probably a bit overkill, this tubing is of great quality and not much more expensive than flimsy tubing. Well worth the extra few cents.
I have skimped on Co2 line in the past, but it really doesn't make sense to do so. I love the fact that this tubing is a.) translucent, b.) braided, and c.) durable. I can tighten a hose clamp without worry that CO2 will leave around the clamp. Really nice tubing.