This Start AXM CFP-4-E-2U Cross Flow Cartridge is in unused condition and is guaranteed to be functional with a 30-day return policy. This item came from a local lab that had surplus now old stock inventory. Listing only includes what is shown in photos. Please feel free to contact us with any questions. Start AXM/AXH cross flow cartridges Rapid concentration and/or diafiltration of biological solutions and suspensions using an open flow path design. Integrated UNF fittings for feed, retentate, and permeate connections allows direct connection to KTAcrossflow? system. Membrane area of 40 cm2 (AXH) or 50 cm2 (AXM) allows direct performance comparison when evaluating multiple membrane pore sizes. Standard path lengths of 30 and 60 cm enables accurate scale-up and scale-down studies. Compatibility: GE Healthcare Ultrafiltration / Microfiltration Systems