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Construction Material: Chlorobutyl rubber
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                          Return Policy
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 20mm Vial Stopper, 3-Leg Lyophilization Style, Bag of 5,000 pieces
20mm stoppers are for serum vials with a 13mm hole opening and 20mm outiside rim to rim diameter.
Constructed with a thinner top flange that facilitates deeper crimping if various 20mm seals (sold separately on this website).
Manufactured using USP chlorobutyl rubber in the USA.