Manufacturer: Chemglass Life Sciences CV12812375. Vial, 20mL, Clear, 20mm Headspace, Round Bottom, 23x75mm, 20mm Crimp, for use with Perkin Elmer Autosamplers. These vials are manufactured from Type 1 Class A Borosilicate glass. Please Note: Pressure Release Aluminum Seals are Designed to Open When the Internal Pressure Exceeds 3.0 +/- 0.5 Bar.