Black Rubber Conical Stoppers (12.5mm, 20 Pack)

These high-quality, black rubber conical stoppers are ideal for sealing flasks, test tubes, jars, and other laboratory glassware. Each stopper measures 22.5mm in height, with a larger diameter of 15mm, a smaller diameter of 10.5mm, and a mid-diameter of 12.5mm. Manufactured from a thermally and chemically resistant rubber compound (GOST 7852-76, 23-6-3), this 20-pack provides a reliable sealing solution. Please note: these stoppers have a characteristic rubber odor. Consider this when using them in non-laboratory settings.