![20mm Round Bottom Vial Stopper, USA, Pack of 100 20mm Round Bottom Vial Stopper, USA, Pack of 100](https://voigtglobal.com/10919-large_default/20mm-vial-stopper-usp-class-6-chlorobutyl-usa-manufactured.jpg)
20mm Round Bottom Stopper, Chlorobutyl Rubber, USA Manufactured, Pack of 100. For vials with a blowback feature.
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20mm Round Bottom Stopper, Chlorobutyl Rubber, USA Manufactured, Pack of 100/
Manufactured in the USA using USP Class VI siliconized, chlorobutyl rubber. Ideally for use with vials that have a blowback feature in the neck opening.
We also offer a USA manufactured 13mm snap on chlorobutyl stopper