Cap, crimp, headspace, aluminum, PTFE/silicone septa, 20 mm, 100/pk. Cap size: 20 mm 41121800. Vial Specifications. -60°C to 180°C. Vial Type. Crimp Certified Vials, Caps, Septa, and Inserts at Competitive Prices. through chromatographic analysis. Vial and cap packs are 100 % traceable Crimp-top Verex™ vials use cost-effective