EP Preserved™ Vials with Preservatives, Aijiren Tech. Level 1 glass vials for use in testing for Volatile Organic Compounds (VOC). Vials are tare-weighed and have pre-applied labels. Propylene caps are open-top with 0.125 PTFE/silicone septa. Capacity: 40 ml. Height: 9.5 cm (3³/₄").