10 ft Soft Flexible CO2 Proof Tubing --- 1/8" ID x 3/16" OD, Clear PVC, 44 PSI --- Will Ship Full Length, Uncut, for the orders of 2 or more.

CO2 permeability (cc.mm/cm2.sec.mmHg) x 10^-10) (lower number = better)

PVC @ 6.8              <<< === Best
Nylon @ 20
Polypropylene @ 90
Tygon Fuel @ 100 P
Tygon Lab @ 360
Vinyl @ 360
Polyurethane (clear and aqua-tint) @ 395
Norprene @ 1200 Gum Rubber @ 1311
Tygon Pressure @ 2700
Tygon Ultra-chem resistant @ 4840
Silicone @ 20,132   <<< === Worst