Alibaba flat bottom vial inserts suit for thread vials white 20ml 5.0 borosilicate glass headspace vials with 27138 Supelco Vials, screw top with solid green Thermoset cap with PTFE liner, preassembled, pkg of 100 volume 4 mL, clear glass vial, O.D. × H 15 mm × 45 mm, thread for 13-425 Application It has been used in decanting serum for residue analysis using GC