PerkinElmer. Aluminum CrimpCaps (100), 20 mL Clear Glass Screw Top Vials (100), PTFE/Butyl (red) Septa with Steel Magnetic Screw Caps (100), PTFE/Silicone (white) Septa with Steel Magnetic Screw Caps (100), Needle SealAssemblies (2), O-Rings (10), Pressure Gauge with Needle for Vials (1), Static HeadspaceGC…. Compare this item.