The „one-turn“ cartridge system: For simple, rapid “hands only” fitting of cartridges and precolumns. manu-CART® endfittings for the LiChroCART® cartridge system are ingenious. They are re-usable and fit every cartridge length with different internal diameter. And a simple turn permits an easy and problem-free integration of a guard cartridge. For coupling of two LiChroCART® cartridges a coupling unit can be used and for connecting a LiChroCART® HPLC cartridge with a LiChroCART® 25-4 pre-cartridge the coupling kit.