1.5mL/2mL screw neck ND10, 10-425 thread autosampler vials with matched PP screw seals ND10, PTFE/rubber septa & micro-inserts. Septa (2714S28) Open top polypropylene screw caps without septa are recommended instead of phenolic caps. Phenolic is a sulfur-based product that can flake and contaminate samples when syringe needle pushes through the