Microlab 9-425 Autosampler Vials are Standard ND9mm open top screw glass vials, widely used in HPLC and GC analysis. Be compatible with Aijiren, Shimadzu and Waters’ Autosampler. Feature: 1.All the vials are the uniformly flat bottom for security with inserts. 2.PTFE/Silicone septa are most popular for HPLC applications