These 100mL PYREX® round bottom centrifuge tubes are useful for the handling of sputum specimens. Digestion, shaking, neutralizing and centrifuging can be performed in one container. They are also useful for other clinical and microbiological tests. Screw caps resist the effects of temperature and steam. These tubes have a white polypropylene GPI 38-400 threaded cap with a Polytetrafluorethylene (PTFE) liner. For replacement caps, see No. 1261-CO (1234B29).