9-425 SCREW VIALS - 2ml sample Vials with unique thread design ensures consistent seal and can be reused, not volatile, easy to use, Amber vial with large writing patch for sample identification and it with ISO 900 certificated. PRESLIT PTFE/SILICONE SEPTA - 2ml Amber GC sample vials included blue ABS Screw Cap & Septa (Blue PTFE/White. Inquiry.