I have the 3603 formula tubing, too. It does kink a lot, more so than the silicone, but that's due to the thin walls. I also love how it looks, crystal clear, but I'll prolly go back to silicone after my experience with Tygon. To each their own, I suppose. Besides, Danger Den is having a 20% discount on 10' or more purchases of silicone, yay.
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