20ml headspace gc vials for sale-Aijiren HPLC Vials. Iso9001 18mm crimp top gc glass vials for GC Aijiren China GC Vial Manufacturers, Suppliers, 20ml headspace vials manufacturer - Factory 250uL Conical Micro-Insert, 31*5.7mm, Suits for 11mm Crimp-Top Vials 250uL Micro-Insert with Mandrel Interior, & Polymer Feet, 29*5.7mm, S