2019/04/16 · Tube, Culture, with Screw Cap, 16 X 100 mm, 25/pk (Product # 2517600) are empty COD vials with caps that can be used for digestion. Tube, Culture, 16 X 100 mm, pk/6 (Product # 2275806) are empty vials without caps that can be used for digestion. Cap, Natural PC 15-415 PTFE/SI Liner (Product # 2942200) is a cap that can specifically be used with the