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This adapter is designed for laboratory vacuum experiments, allowing flow control via a PTFE stopcock rotation The adapter features an inner joint and a straight hose connector; joint size: 19/22 Made of borosilicate glass with high transparency, it provides clear observation of liquid reaction changes and mixing processes for convenient experiment monitoring Instantaneous temperature difference must not exceed 140°C; steady operating temperature: 450°C; avoid exceeding the maximum pressure rating of the tubing and ensure the stopcock is securely fastened during operation 1-year limited manufacturer warranty