The red Corning® open top polybutylene terephthalate (PBT) high temperature caps have a GL32 thread and are designed to be used with piercible silicone septa (sold separately, see No. 1395-32SS or 1395-32TS). They can be dry heat sterilized at up to 180°C.
Product Family Description:
These are various sizes and types of screw caps for use with storage bottles.