Autosampler Vial, Septa, Cap, Chromatography Vial, 8-428 Screw Top Vial, 9-425 Screw Top Vial, Snap Vial, Crimp Vial Company Overview Jiangyin Allpro Polymer Technology Co., Ltd is one of the biggest manufacturers of HPLC/GC Autosampler vials, caps, and septa in China.