Corning 431153 Polystyrene Vacuum Filter/Storage Bottle System, Graduated, Sterile, Polyethersulfone Membrane, 0.22 Micron, 150mL Capacity (Case of 12) Polyethersulfone (PES) membrane has a 0.22m pore size and a 13.6sq cm area for fastest flow rate, lowest protein binding and extractables, and best filtering of cell culture media Graduated funnel and storage bottle have a 150mL capacity and 45mm neck diameter; receiver bottle features easy grip sides for improved handling Includes a sterile plug-seal style orange high density polyethylene cap; angled hose connector simplifies vacuum line attachment Individually packaged, sterile, and certified nonpyrogenic; designed for filtering and storing cell culture media, biological fluids, and other aqueous solutions