Calibrated to contain at 20 C. For determination of water in various materials via distillation with a solvent that is not miscible with water. With full length inner member for connection to distilling flask and a outer joint of the same size to connect the condenser. Addition of a connection between top of vapor tube and graduated tube allows excess solvent to return to the flask with minimal chance of return of condensate. Stopcock has a glass plug with a 2mm bore.
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