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Used to connect condenser and standard joint receiving flask in vacuum distillation 19/22 standard female upper joint and male lower joint; with a small pumping nozzle for vacuum connection; hose fittings for 10mm I.D. hoses Short Stem Adapter is made of borosilicate glass Borosilicate Glass, Heavy Duty Design, Reusable and premium; maximum withstand temperature 200°C StonyLab ensures premium and premium customer service