DescriptionRubber plug is used to seal equipment in chemical experiments, such as pharmaceutical, chemical, mechanical, and scientific research industry. Perfect for demanding sealing applications, industrial, lab, marine and household uses. Also used for heavy-duty equipment isolation applications.Features- Color: As the picture shown. - Material: Rubber. - Size: About 4.2 * 3 * 3cm(L * W * H). - Temperature Range: - 20C ~100C. - The basic piece of homebrew supplies out there. - Fit securely in the mouth of your carboy or fermenter. - Create an airtight seal that keeps oxygen from tampering with your brew.- Plug up your carboy with this rubber stopper. - Perfect for demanding sealing applications, industrial, lab, marine and household uses, also used for equipment isolation applications.