Precleaned VOA Vials, C&G Containers, Inc. LT33A000A01AZS. 30621-252CS 131.46 USD. 30621-252. Precleaned VOA Vials, C&G Containers, Inc. VOA Vials are most commonly used for Volatile Organic Compound Analysis. Preclean Divisions are as follows: L1: Pre-cleaned and Certified with Certificate of Analysis. L1/BC: Pre-cleaned and Certified with