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Septa Marathon 1/2" (12.7 mm) CenterGuide (50/pk)
Long injection life, pre-pierced for minimal coring. Maximum temperature 350 deg. C. CRS Marathon septum typically achieves 400 injections without failure. Marathon is ideal for standard manual-injection GC and GC/MS. 11 mm diameter, 3 mm thick. CenterGuide design requires less force for initial penetration, for a smoother feel. Septum life may be enhanced in some applications by minimizing tearing and coring.