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. Returned condensed solvent line is just above graduated tube. Stopcock has a PTFE plug with a 2mm bore.
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