2021/7/27 · A new Zero-Bubble septa (ZB Seal™ Closure) has been engineered and designed by (ILT) specifically for EPA vials. This revolutionary compression molded PTFE/Silicone liner is assembled into a 24-414 Heavy Walled cap to create the ZB SEAL™ Closure system. This complete liner system reduces liner fallout and enhances long term storage of samples.