The manufacturer of the Kratos Spectroflow 400 HPLC Solvent Delivery System is Kratos Analytical. The Kratos Spectroflow 400 HPLC Solvent Delivery System is a virtually pulse free dual-piston pump with selectable flow rates from 10 uL/min to 4.99 mL/min. Pressures can be used up to 400 BAR (6,000 PSI) continuously or up to 490 BAR (7,000 PSI) intermittently. The two pump heads operate in series, and the eluent always flows through both pump heads in one direction. The pre-owned products will be thoroughly cleaned and fully tested to perform at manufacturer specifications before shipping.