223801 - 6 mL, 23x38 mm, clear flat bottom headspace vial with beveled lip (for tighter seal) and flat bottom. Type 1 borosilicate glass. 320001 - 20 mm aluminum open-hole crimp cap fits standard 20 mm vial lips, such as on headspace vials. Made from lacquered aluminum.320101 - 20 mm PTFE/silicone septum for headspace analysis; including a layer of PTFE.