... can manufacture you all kinds of boiling flask with standard ground mouth with good ... in china, such as- beaker series, boiling flask series,glass tubes,bottles series ,measurements, desiccator series ... flask, filtering flask,flask eggplant shape ,eggplant shape ,long neck,flask pear shape ,flask pear shape with two necks or with three necks,Elstilling flask pear shape,distilling flask pear shape ...