Apr 06, 2021 · Autosampler Vials,Headspace Vials,Chromatography 9mm Screw Top PP Caps for 2 ml vials and caps supplier 9mm HPLC Vial Our 9 mm Wide Mouth Vials and Closures are our recommended screw thread vials. These vials are autosampler compatible and offer a 40% larger opening than 8-425 thread vials, simplifying pipetting and other routine functions.