Autosampler Vials, Caps and Closures | aijiren Tech Scientific Clear glass or polypropylene inserts for 9mm HPLC and GC autosampler vials are available in a GC Autosampler Vials 2.0 mL, Clear glass, 6.0 mm opening, crimp top, silanized 2.0 mL Clear vials, with PTFE/red rubber cap, unassembled closures and septa.