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12 mm TruSeal (100/pk)
Brand: Chromatography Research Supplies Inc12 mm TruSeal is white PTFE layer on red silicone. It fits 13-425 thread screw caps. Silicone seal for routine sampling. This seals offer reduced permeability and lower bleed than natural rubber, and resist degradation from -68 deg. C to 250 deg. C.
