Aijiren 24mm TOC/VOC EPA vials 2020 New 40ml Sample Storage Vial for TOC–Aijiren Vials for In order to adapt to different customers, they have 24mm openings and 24-400 standard threads. The sample storage vial can also be Sample Vials | VWR Sample Vials. General-purpose sample vials are used for collection, storage, and transportation procedures.