Product Number Product Description Pricing HAWP04700 MF-Millipore ® Membrane Filter, 0.45 µm pore size Expand HVLP04700 Durapore ® Membrane Filter, 0.45 µm, 0.45 µm pore size, hydrophilic PVDF, 47 mm membrane Expand GVWP04700 Durapore ® Membrane Filter, 0.22 µm, 0.22 µm pore size, hydrophilic PVDF, 47 mm membrane Expand GSWP04700