20mm Crimp Top Cap suit for 20mm Headspace Vial
https://www.hplcvials.com/products/6-20ml-gc-headspace/20mm.html

20mm Crimp Top Cap suit for 20mm Headspace Vial

Crimp Caps squeeze the septum between the rim of the glass vial and the crimped aluminum cap. This forms an excellent seal preventing evaporation. The crimp cap vial requires crimping tools to carry out the sealing process.

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