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  1. Glass Tubing | Fisher Scientific

  2. Glass Tubing - McMaster-Carr

  3. Glass Tubing | SCHOTT

  4. Pegasus Glass | Glass Tubes, Glass Rods, Glass Media Bottles ...

  5. Standard Glass Tubing

  6. Amazon.com: Industrial Glass Tubing - Industrial Glass Tubing ...

  7. Friedrich & Dimmock Glass – Borosilicate Glass Tubes, Quartz ...