20 mm Headspace Vials, Septum, and Caps Headspace Vial, Square Crimp Top, 75.5 x 22.5 mm, Round Bottom Diameter (Metric) Opening 20 mm Diameter (Metric) Inner 22.5 mm Color Clear Material Glass Volume (Metric) 20 mL Volume (Metric) Residual 0.8 mL Volume (Metric) Working 1.5 mL 2 mL 10-20mL 18mm Screw Thread Headspace ND18–Aijiren HPLC Vials Headspace Vial, Round Bottom, 22.5*75.5mm, 5.0