Professional gc headspace vials with closures for sale Common use clear headspace vials 20 ml with flat bottom. 1-4mL Autosampler Vials for HPLC, UPLC, GC 16mm, 25mm Test Tubes for Water Analysis 6-20mL GC Headspace Vials 8-60mL EPA Storage Vials HPLC Syringe Filters 1.5mL 11mm Snap Ring Autosampler Vial ND11 Material: USP Type 1, Class A, 33 Borosilicate Glass.