LCGC Certified Clear Glass 12 x 32 mm Screw Neck Vial, Total Recovery, with Cap and Preslit PTFE/Silicone Septum, 1 mL Volume, 100/pk. As a leading manufacturer of analytical instrumentation and consumable products, Waters knows how important it is to choose autosampler vials that enhance the performance of your other instrumentation. Everything from needle design to volatility to cleanliness will matter when making this decision and is taken into consideration during the creation of our vials.