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Made of borosilicate glass, these inexpensive portable methods of titration are filled by pressure through a tube extending from the bottle up inside the graduated tube. A small hole in the filling tube at the zero line permits settling of the liquid level and return of the excess to the bottle. Furnished complete with buret, bottle, vent tube (LG-4230-130), pinchcock clamp (LG-4647-100), bulb (LG-4340-100), and rubber stopper*. *NOTE: Supplied with #9 Rubber stopper (LG-10392-126) for 10mL, and #10-1/2 rubber stopper (LG-10392-130) for 25 & 50mL. Scientists rely on the expertise and artistic skills of Wilmad-LabGlass' engineers and glass specialists to manufacture NMR and EPR consumables and laboratory glassware of the highest quality. Used daily in academia, healthcare and chemical, petroleum and other industrial applications, Wilmad offers 7000+ items as part of their standard catalog as well as custom fabrication for individual glassware, glass repair services and OEM glass parts.