The II Preparative LC System is an easy-to-use workhorse for automated sample injection when gradient elution is required. The binary gradient pump delivers flow rates up to 50 mL/min for purification up to 30.0 mm id columns. This preparative HPLC system is tailor-made for routine, laboratory-scale purification when milligrams to grams of starting material are available and can be upgraded to further enhance the system.