Nalgene™ Rapid-Flow™ Sterile Disposable Bottle Top Filters with SFCA Membrane, 500mL, 0.2μm pore, 45mm neck. Catalog number: 291-4520. 165.00 / Case of 12. Add to cart. Nalgene™ Rapid-Flow™ Sterile Disposable Bottle Top Filters with PES Membrane, 150mL, 0.2μm pore, 33mm neck. Catalog number: 596-3320.