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Sigma Aldrich Fine Chemicals Biosciences Serrated natural rubber se
Supplier: Sigma Aldrich Fine Chemicals Biosciences Z5121411PAK
Closure has a turnover flange molded to grip outside of container neck promoting a double seal in conjunction with annular serrations on a hollow plug. Annular serrations depress themselves against the inside wall of the bottle neck making each serration a suction sealing point.Note for extra security when using large bore transfer needles fasten septum to bottle or flask opening with a wrap-it tie. See ties and accessory tool listings on next page.
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