EPA TOC Sample Storage Vials (Part of Products) 10 means 10ml, 20 means 20ml, 30 means 30ml, 40 means 40ml, 8 means 8ml, etc. VA is screw headspace vial, VH is crimp headspace vial, R is stand for Round Bottom. For Example: V2015,20 means 20ml, 1 means clear color, 5 means 5.0 type, so V2015 means 20ml clear EPA vial , 5.0 type.