At this point I don't think any exists. Primoflex LRT use to be good stuff that took a long while to cloud up. However new batches cloud very fast.
Clearflex, Primoflex LRT, Tygon R3603, Tygon B-44-4X all clouded from my experience. I have some Tygon B-44-3 that I am trying now, but I won't have results for a while.
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