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Versatile Compatibility: this 1-pack solid glass stopper is specifically crafted to fit glassware with 19/22 outer joints, ensuring a precise and secure fit Prevent Leakage: ideal for sealing laboratory equipment with ground glass joints, preventing any spillage or leakage of liquids and gases during experiments Premium Material: constructed with durable borosilicate glass, offering high clarity, excellent chemical resistance, and the ability to withstand high temperatures Multiple Sizes: choose from various sizes to accommodate different diameters and depths of laboratory instruments, providing versatility for a wide range of scientific applications Warranty: 1-year coverage period for your peace of mind, if received damaged, please let us know and we will solve it promptly