LLG-Screw Neck Vials and appropriate Micro-Insert. LLG-Screw Neck Vials for Storage Purposes ND 15, ND 18. LLG-Screw Neck Vials ND10, wide opening and Micro-Inserts. LLG-Screw Neck Vials ND24 (EPA Vials) LLG-Screw Neck Vials ND8, small opening. LLG-Screw Seals for Screw Neck Vials ND 15, ND 18.