15x45mm 4mL vials are widely used in compound storage as well as for chromatography sample vials.4mL vials are compatible with 13-425 screw thread closures,is for cleaning the needles during automatic sampling.13-425 screw thread caps, septa, and vials are designed for specific use with the Shimadzu and Waters WISP 48-Position Autosampler.4mL vials are widely used in compound storage as well as for chromatography sample vials.