White PTFE/Red Silicone Septa + Blue Screw Cap with Hole, for 2ml 9-425 Screw Top Glass Vial, 100/pk. Part Number: CRX2000-1011. A wide variety of caps with different septa are available. Some factors may influence the type of septum you choose including sample compatibility and ability to reseal. Add to cart. Categories: ChromineX