clear 40ml VOA vials with high quality Shimadzu-Lab Greenwood Products 03-40HCL.2723 Preserved 40mL Clear VOA Vial, Bonded T/S Septa Cap 0.2mL 1:1 HCL, Certified with C.O.A. (72/cs) EPA standards for volatile organic sampling. Open top vials may be used directly with many automated purge and trap instruments.