Black Rubber Cone Stopper 5mm (1 pc)

This high-quality black rubber cone stopper (size #5) is ideal for sealing flasks, test tubes, jars, and other laboratory glassware. Measuring 13mm in height, it features a larger diameter of 7mm and a smaller diameter of 3mm, with a center diameter of 5mm. Manufactured from a chemically and thermally resistant rubber compound (GOST 7852-76, 23-6-3), this stopper is durable and reliable. Please note: These stoppers have a rubber odor; consider this when using them for non-laboratory applications.