Features of 1.5mL 9mm Short Thread Autosampler Vial ND9. 1. 9mm screw vials can be used on all common autosamplers. 2. Standard narrow neck design for GC and HPLC. 3. 9mm wider opening for easy puncture. 4. 9mm PTFE/silicone septa, has excellent chemical inertness, acid, and alkali resistance.