Aug 21, 2017 · 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. PRESLIT PTFE/SILICONE SEPTA - 2ml Amber GC sample vials included blue ABS Screw Cap & Septa (Blue PTFE/White Silicone Liner).