This extremely popular quaternary low pressure gradient system is shown here with a Cecil column heater/chiller, which should be ordered extra if required. The CE 4104 dual piston pump has flow rates from 0.001 to 10µL/min and a maximum operating pressure of 40MPa. The pump has all the facilities for gradient formation, with low pressure mixing of up to 4 solvents. Four, proprietary, high performance, high reliability, proportioning valves are used to control up to four solvents and a high performance, low volume, dynamic mixer is used for ultimate gradient quality. The Adept CE 4200 dual wavelength detector is used with an 8µL x 10mm flowcell. The Rheodyne valve with 20µL loop is mounted by a small panel to the detector. When an oven is not used the column may be mounted together with the valve on mounting panel CE 4050. The CE 4900 PowerStream system controller is placed at the centre of the very compact stack. Full control and data processing ar provided for use in Windows. The system is supplied complete with solvent and pipe organiser, CE 4134, 8µL x 10mm flowcell and installation kit 4150 14 00.