Whatman PTFE Mini-UniPrep G2 syringeless filters, 0.45 µm, translucent housing, slit septum cap, 1000 pack, GS503NPUORG. Regular Price: $4,199.66. Price $3,651.88. Add To Cart. Whatman 6869-2502 GD/X 25 mm Syringe Filter, nylon high charge (positive), nylon filtration medium, 0.2 um (150 pcs) Regular Price: $505.85.