2mL 9-425 Autosampler Vials. Short screw thread ND9 vials (12*32mm) autosampler vial, widely used in HPLC and GC analysis. Features. Materials:borosilicate glass. Volume:1.5-2 ml, 12 x 32 mm. Vial Color: Clear & Amber. Septa material:PTFE & silicone septa. Cap:blue or black cap with 9-425 thread. Cap with closed top or with centre hole.