Glass funnels support filtering, filling, decanting, and transfer of liquids and powders. Types include filter funnels with narrow stems, Buchner funnels for vacuum filtration with perforated plates, and dropping funnels with stopcocks for controlled reagent addition. Options cover plain stems or ground-glass joints and a range of diameters to match filter papers and tubing. Borosilicate construction provides chemical resistance and thermal stability for routine laboratory use.