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Pall 4800 MicroFunnel Filter Funnel 100 mL with 0.45 µm GN-6 Metricel Membrane, White, Gridded, Individually Bagged, Pack of 50: Amazon.com: Industrial & Scientific
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Pall 4251 Acro 50 Vent Devices with PTFE Membrane, 50 cm, 0.2 µm Pore Size, Hose Barb, Pack of 18: Science Lab Filters: Amazon.com: Industrial & Scientific
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