30 Ml Vial found in: Screw neck vials (EPA), N 24, 30 mL Polypropylene Vials, Wide Opening Snap Top Vials, Shipper, 40 mL, Vials. Cs. 8, 30 ML VIAL, 22-400.. thread EPA vials for the collection and storage of water samples comply with the guidelines for establishing test procedures for the analysis of pollutants (Ref. EPA Methods 601, 602, 603 and 604).