Clear borosilicate glass vials available in three sizes with the standard, 0.125" thick, I-Chem blue, Teflon/silicone septa in an open-top 24-414 polypropylene cap. The I-Chem molded-in septa retainer ring holds the septa securely in place without bonding to the cap, so septa can be removed and replaced as needed. 200 series vials are available in a convenient, I-Chem Certified 200 Series vials are guaranteed to meet the EPA's performance based specifications for volatile organic analysis.