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Use SureSTART 20 mm Stoppers (Level 2 ) for GC applications, when robustness and reproducibility are key
Use SureSTART 20 mm Stoppers (Level 1) for your everyday GC chromatography analysis.
Save time and reduce risk of contamination. These Thermo Scientific™ Gray Butyl Stoppers offer matched quantities of 20mm headspace vials.