GC Headspace Vials, EPA Sample Storage Vials, COD Tubes . VA, VH, VHR are stand for headspace vials, 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. COD Test Tubes: