Crimp caps work well for GC and GC/MS applications, help avoid sample tampering, and are recommended for working with volatile compounds Chromatography Autosampler Vial Caps Only (1,358) Chromatography Autosampler Vials Only (1,303) Chromatography Autosampler Vial and Closure Kits (1,149) Chromatography Autosampler Vial Septa Only (259)