Headsapce vial-Aijiren Vials for HPLC/GC 18mm Screw Magnetic Precision Caps for GC Vials. The optional capacity is 10ml 20ml and the specifications are 22.5 x 46mm, 22.5 x 75.5mm, providing both colorless and brown headspace vial. The 20ml GC Analysis Headspace Vial Series strictly controls the H