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the Agilent Cartridge System (AC) cartridge holder for 2.0, 3.0, 4.0 and 4.6 mm id cartridges with part number 5021-1845 fits all our Lichrosphere and Lichrocart columns. The system is comparable with the original Lichrocart-system. Our website shop always shows for a chosen column if it needs 5021-1845. The system is not useable with our ZORBAX or POROSHELL brand of columns, they are designed differently.