Whatman Puradisc 25 mm PTFE Syringe Filters, 0.2 µm, 50 Pack, 6784-2502 Regular Price $189.24 Price $164.34 Add to Cart Whatman 6874-2502 GD/X 25 mm Syringe Filter, PTFE filtration medium, 0.2 um (150 pcs) Regular Price $539.90 Price $468.86 Add to Cart Whatman Puradisc 4 mm PTFE Syringe Filters, 0.2 µm, 50 Pack, 6777-0402