CHROMABOND™ vacuum manifold for simultaneous preparation of up to 12 samples. The manifold consists of a rectangular glass cabinet with a vacuum gauge and a polypropylene lid, that can hold the columns or cartridges. The replaceable valves on the lid allow individual vacuum control for each solid phase extraction column, if required. The cabinet is fitted with a variable rack with exchangeable partitions, that accept a wide variety of vessels like test tubes, measuring flasks, scintillation vials, autosampler vials, plastic vials and many more. The vacuum in the chamber can be adjusted with the control valve and read from the gauge.