1.5mL clear silanized glass vials (no caps) with writing patch and approx. 500uL gradations. Short-thread, 9mm opening. Use caps with PTFE/silicone septa (non-slit or pre-slit,) or PE septumless cap. Note that the septumless cap is a thin membrane and NOT resealable after puncture by the autosampler needle. For multiple injections from the same vial, a cap with a PTFE/silicone septum is recommended. For PFAS analysis, use blue cap with PP (polypropylene) liner with silicone septum 220-97331-91.