Headspace Caps found in: Supplies For , A and Headspace Units, Headspace Caps and Septa, Metal Threaded Closure (18mm), Headspace Vials,.. 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),