These black stoppers are made of solid natural rubber and stays pliable over a long period of time. ideal for non aggressive or concentrated solutions and contains a low sulfur content. Withstands temperatures from -13 to 15...

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These black stoppers are made of solid natural rubber and stays pliable over a long period of time. ideal for non aggressive or concentrated solutions and contains a low sulfur content. Withstands temperatures from -13 to 158°F (-25 to 70°C).

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