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Receiver adapter made of high quality borosilicate glass with vacuum connection and screw thread. 14/23 socket size, 14/23 cone size. Vacuum connection has an inner diameter of 4mm and an outer diameter of 7mm. Eisco Labs Borosilicate glass has the following heat tolerances: Strain Point -515°C | Annealing Point 565°C | Softening Point 820°C.