Jul 09, 2020 · 6-20mL GC Headspace Vials. 6-20mL 20mm Crimp-Top Headspace ND20 10-20mL 18mm Screw Thread Headspace ND18 Hand Crimper, Decrimper. 8-60mL EPA Storage Vials. 8-12mL 15-425 Screw Neck Vial ND15 20-60mL 24-400 Screw Neck Storage Vial ND24. 16mm, 25mm Test Tubes for Water Analysis. 10-15mL 16mm Test Tube for Water Analysis.