Nalgene bottle-top sterile filter units Sigma-Aldrich
Bottle-top filter holders reusable, 33 mm | Bottle-top filter systems | Filtration and separation | Filtration, Water Purification, Dialysis | Labware | Carl Roth - International
431174 | Corning® 1000 mL Bottle Top Vacuum Filter, 0.22 µm Pore 54.5cm² PES Membrane, Fits 45 mm Diameter Necks, Sterile, 12/Case | Corning