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Wheaton* 40 ml Sample Vials with Cap
These vials are ideal for use in water sampling according to EPA 40 CFR 136, "Guidelines for Establishing Test Procedures for the Analysis of Pollutants." The open-top screw cap has a specially designed septum of 10 mils of Teflon* facing 90 mils of silicone. Vials have a 40 ml (10 dram) capacity, measure 27.75 x 98 mm (Dia. x H, with cap on), and utilize a 24-400 screw cap.