Thermo Scientific 13 mm Certified Screw Thread Vial Kits. These certified convenience kits include 4 mL (15 x 45 mm) glass vials and 13-425 screw caps with bonded red PTFE/white silicone septa. • National Certified Vial Kits are fully lot-tested including HPLC and GC analysis for 15 c. Pricing & More Info.