20 ml headspace vials and caps-Lab Chromatography Supplier Headspace Vials & Caps Part Number: Vial kit, crimp top, headspace, clear, 20 mL, silver aluminum caps with safety feature, certified, flat bottom, molded PTFE/silicone septa, 100/pk. Vial size: 22.75 x 75 mm (20 mm cap) Add to Favorites