20mm Vial Butyl Stoppers 100 Pcs, Mushroom Self Healing Injection Ports Solid Seal, for Glass Vial and Liquid Culture Jars, Can Be Sterilized by Steam and Repeated Used,Butyl Stoppers by Ks-Tek

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20mm Vial Butyl Stoppers 100 Pcs, Mushroom Self Healing Injection Ports Solid Seal, for Glass Vial and Liquid Culture Jars, Can Be Sterilized by Steam and Repeated Used,Butyl Stoppers by Ks-Tek