Headspace Crimp Cap found in: Headspace Vials, Headspace Caps and Septa, Headspace 20mm Crimp Seals with Septa, Headspace Vial Convenience Kits, Round.. Aluminum Crimp Caps (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 Seal Assemblies (2), O-Rings (10