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Made of high quality rubber material, durable, washable and reusable For 20mm glass bottles and liquid culture bottles, suitable for openings of about 12.5mm in diameter The culture medium can be injected with injection needle without removing the rubber plug High temperature resistance and washing resistance can form excellent sealing performance, thus prolonging the service life of the materials in the bottle Suitable for kitchen, laboratory, hospital, etc. Suitable for liquid culture, injection, dosing tank and cereal masterbatch