These conical centrifuge tubes combine the better separation/pelleting capabilities of a conical tube with the superior sealing capability of Oak Ridge tubes. Graduations are silkscreened from 5 to 35 ml in 1-ml increments. Accommodate NALGENE sealing caps (Cat. No. DS3132-0024) and require conical tube adapter (Cat. No. DS3147-0050). Before autoclaving, just set closure on top of the tube without engaging the threads. Must be filled to at least 80% of the total capacity for proper performance.