Jul 08, 2021 · 24mm 40ml VOA vials with high quality Thermo Fisher I-Chem™ Open-Top Septa Caps, 24-44mm, bonded Thermo Scientific Septa Caps include a bonded-in 0.045 in. thick septa. The same high quality septa caps used on our Thermo Scientific VOA Vials, septa bottles and septa jars.