Phenomenex Inc, Torrance, Calif, has introduced the Presston 100 positive-pressure manifold for sample preparation. An alternative to the vacuum manifold, the Presston 100 applies pressure from above to pass liquids through the sample preparation products. The device reduces the inconsistent pressures that are inherent in vacuum techniques, and its high-pressure capability enables the separation of viscous samples. A single unit can prepare samples in tubes or 96-well plates. It is compatible with a number of technologies, including Phenomenex Strata solid phase extraction, Novum simplified liquid extraction, and Clarity synthetic DNA and RNA biosolutions. For more information, visit Phenomenex.