General-purpose columns with an integral reservoir for analytical separations.

Constructed of borosilicate glass. Top is tooled for rubber stopper. A plug of glass wool can be used to support the column packing. Flow rate is controlled by a 2mm bore PTFE stopcock plug with an 11/25 plug size, a 1:5 taper, and a threaded pressure nut. Recommended for RCRA SW-846 methods.