Voc Vials found in: Pre-sealed vial-closure combinations with screw neck, N 24, Bailers, Vial, VOA, 40 mL with 5 ML Methanol & Tare Weighed, Vial, VOA.. with screw neck N 24 for highest protection of the vial against any contaminations from its surroundings Used in environmental analyses (TOC/VOC) to protect the vial against organic compounds from the lab environment Closures are screwed