1.5mL clear glass vials (no caps) with writing patch and approx. 500uL gradations. Use caps with PTFE/silicone standard or pre-slit septa, 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 one of the following caps with a silicone septum and PP (polypropylene) liner: 220-97331-91 (100/pk), 220-97331-92 (500/5pk), or 220-97331-93 (1000/pk.)