Screw caps are sold separately in assorted colors Internal Sealing Ring sandwiches the top of the tube to provide a positive seal to prevent liquid bypass. Continuous threads require only a 1 1/4 turn to tighten. Caps are compatible with Sarstedt and Porex. The nitrile O-ring provides exceptional chemical resistance while further enhancing the integrity of the seal. Polypropylene caps and tubes are fully autoclavable.
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