Sarstedt (Newton, NC) has introduced a screw cap with pierceable membrane for use with its range of 0.5 mL to 2 mL micro tubes. When used in combination with a screw cap micro tube, the membrane cap enables efficient filling without unnecessary cap manipulation. Made from medical grade polypropylene, the cap features an O-ring for leak-resistant sealing and an integral pierceable membrane that can be punctured with a probe or needle multiple times. Alternatively, direct sampling through the membrane is also possible.

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