22mL BUTYL HS CONVENIENCE KIT 100 Pack, PerkinElmer N9303990. Headspace Butyl Convenience Kit contains everything you need to run Gas Chromatography. 20 mL Headspace Convenience Kit - Crimp Top Clear Glass Vial with PTFE/Butyl (Red) Septa, Aluminum Cap and Star Spring, 100/pk | PerkinElmer