Screw neck vials (EPA), N 24. combination with the 40 mL vial Vial container available for 20 mL, 30 mL and 40 mL vials. Vials are packed with 100 pieces in tamper-evident, non-abrasive PP-Boxes For all vials you can ask for a certificate of conformity (CoC) for your own ISO documentation. Barcoded vials upon request.