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Product Manager on Twitter: "🆕 #BIIR GL 25 Stopper for GL 25 Lab Bottles @DWKLifeSciences The GL 25 and GL 45 DURAN® stoppers are moulded from a high-purity bromobutyl rubber. A material
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Wheaton W224100-420 Rubber 13mm Straight Plug Stopper, Gray Bromobutyl/39 (Case of 1000): Science Lab Rubber Stoppers: Amazon.com: Industrial & Scientific
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