These 50 mL 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. The 50 mL tube has a black phenolic GPI 24-410 threaded cap with a glued-in, white rubber liner. For replacement caps, see No. 9999-241.