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Reducing connecting adapter used to connect glass instrument interfaces of different diameters or types Feature a 24/29 outer joint and a 24/40 inner joint Made of borosilicate glass, it exhibits excellent corrosion resistance and a low coefficient of thermal expansion; stable operating temperature: 450°C Inspect the product for cracks before use; instantaneous temperature changes must not exceed 140°C; Plastic joint clip or metal clamp could be used to secure connecting position for better result Warranty: 1-year limited manufacturer warranty for peace of mind