Title: Black Rubber Cone Stopper, 21.5mm, 1 pc

Description: This high-quality, black rubber cone stopper (21.5mm) is ideal for sealing flasks, test tubes, jars, and other laboratory glassware. Perfectly suited for flasks with a 22mm diameter. The stopper measures 30mm in height, with a larger diameter of 25.5mm, a smaller diameter of 19.5mm, and a mid-point diameter of 21.5mm. Manufactured from a thermally and chemically resistant rubber compound (GOST 7852-76, 23-6-3), it withstands temperatures ranging from -8°C to +80°C. Please note: These stoppers have a rubber odor; consider this when using them in domestic applications.