20ml, 30ml, 40ml and 60ml EPA (VOA/VOC) Vials. 40ml EPA Vials have long been the vial of choice for VOA and VOC sampling and analysis however our comprehensive range includes 20ml, 30ml, 40ml and 60ml Vials. All are available as Certified, Pre-cleaned & Standard formats for use in purge & trap autosamplers, for sampling or storage.