standard opening EPA vials for lab use professional TOC/VOC EPA vials PTFE/silicone septa--glass Ultra Clean EPA VOA Vials. 40mL 27.5x95mm Clear Glass EPA/TOC Vial 24-400 White Open Top PP Screw Cap with 22mm Natural PTFE/White Silicone 3.0mm thick Septa (EPA Quality). 100pcs/pk. Economy Certified Glass VOA Vials with 0.125in.