The MXX777-601 is the standard 2-position, 6-port switching valve designed for traditional low pressure chromatography and applications including sample injections and flow diversion for your system. All MXX valves accept either 1/16" or 1/8" tubing. Both ferrule sizes are shipped with all models. Analytical scale models come with 1/16" ferrules installed in the valves, and large Bore models come with 1/8" ferrules installed. Simply unscrew the spanner and remove the ram to access and switch the ferrules to accommodate the other size tubing. For higher flow rates and semi-preparative applications the large bore MXX777-612 is available.