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PYREX 50mL Screw Cap Culture Tubes with Phenolic Caps, 22x175mm. Deep-form 18-415 GPI threaded Phenolic caps facilitate handling and sealing after autoclaving. Caps fabricated from special formula resistant to effects of temperature and steam in autoclaving; glued-in, white rubber liner. Tube Material: Borosilicate Glass Code 7740. Capacity: 50mL (Approx). Length: 175mL (Approx). Tube Outer Diameter: 22mm (Approx). Neck Outer Diameter: 18mm (Approx). Style: Culture Tube, Round Bottom, Untreated Surface, with Black Phenolic rubber-lined Screw Cap. Corning #: 9825-22.