The Red Corning® open top polybutylene terephthalate (PBT) high temperature caps have a GL45 thread and are designed to be used with piercible silicone septa (sold separately, see No. 1395-45SS or 1395-45TS). They can be dry heat sterilized at up to 180°C. Reusable, Non-Sterile, and Polybutylene Terephthalate Cap material.
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