5. Precise bottle neck size, ensure autosampler handle correctly. 6. Suitable for Thermo Sciebtific, Beckman, Gilson, Knauer, Spark, Varian, VWR(Merck)/Hitachi, PerkinElmer autosamplers. Features. 1. 9mm screw vials can be used on all common autosampler. 2. Standard narrow neck design for GC and HPLC. 3. 9mm wider opening for easy puncture.