420000-0000 is a plain column with an integral reservoir. It is tapered to a 2 mm bore capillary tip and has a top tooled for a #2 rubber stopper

·         420100 series are general purpose columns for quick separations.  Their funnel-shaped tops permit easy filling and hold additional solvent

·         420300 series are basic columns used for many separations in adsorption and ion exchange chromatography

·         Glass wool (not supplied) is used to support column packing

·         Manufactured from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements