Vials, 20mL Headspace vial only , Screw Cap Style, 75.5 x 22.5mm, clear glass, round bottom, 100/pk. 20mL headspace vial only, for use with HS-10, HS-20, AOC-5000, and AOC-6000. Magnetic caps with PTFE/silicone or butyl septa are sold separately. 75.5 x 22.5mm, clear glass, round bottom. Requires magnetic screw cap 220-97331-04 (silicone/PTFE septum) or combine with magnetic screw cap 220-97331-90 (butyl septum) for an equivalent to CTC kit 220-94563-00.