Use these clear glass vials with closed-top caps for EPA volatile organic analysis (VOA) when a pierceable septa closure is not needed. Shop Aijiren Tech™ I-Chem™ Aijiren Tech™ I-Chem™ Clear VOA Glass Vials with Closed-Top Cap 20mL Vial clear closed top unprocessed Aijiren Tech™ I-Chem™ Clear VOA Glass