not sure... but i had some tubing being used for 6-8 months or so and noticed that i wasnt getting any co2 into the tank b/c the tubing got weak and crimped at a bend.what is the time frame for the tubing to become brittle? I use plastic/vinyl and have had no signs of whitening or becoming brittle. I figured that I wouldn't go with the Co2 tubing until my plastic tubing gave way.