20ml Sample Vials found in: Sample tray,CTC,32 10 or 20ml vials, Vial, Berlin-Qorpak, Sample, Clear, 20ml, Borosilicate Glass, Screw Thread Cap, 144 per.. or configuration. Easy sample handling The 20ml-sample vials are designed for quick and easy handling: you simply add the sample, cover the vial with an adhesive foil and place a rubber seal on top of the vial.