Millipore Express PLUS Membrane Filter, 0.22 µm pore size, hydrophilic polyethersulfone, 47 mm idiameter. LSWP04700. Mitex ™ Membrane Filter, 5.0 µm pore size, hydrophobic PTFE, 47 mm. AP4004705. Glass Fiber Filter without binder, 0.7 µm pore size, hydrophilic glass fiber, 47 mm diameter. HAWP02500.