crimp top flat bottom gc headspace vials with screw caps price 2022 - 10 - 24 VWR 20ml screw headspace glass vials with flat bottom for GC Material: USP Type 1, Class A, 33 Borosilicate Glass Dimensions: 22.5 x 46mm/22.5 x 75mm Application: GC system Neck Diameter: 18mm Qty/Pack: 100pcs/pack Volume: 10-20ml Payment: T/T MOQ: 1 pack