Black Rubber Conical Stoppers (12.5mm, 2 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 durable, heat and chemical-resistant rubber compound 23-6-3 (GOST 7852-76), these stoppers are designed for reliable sealing. Please note: These stoppers have a rubber odor; consider this when using them for non-laboratory applications. This 2-pack provides a convenient supply for your needs.