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This 250mL MF75™ series filter unit consists of a polystyrene housing and a PES membrane. Ideal for biological and pharmaceutical sterilization requirements it has graduations on both uppers and receivers. Also has a side-arm with a cellulosic vent plug and quick-disconnect tubing adapter and comes with a leakproof threaded closure for receiver. Blue collar. Capacity: 250mL upper and receiver. Material: polystyrene housing with a PES membrane. Membrane diameter: 50mm. Pore size: 0.45µm. Nalgene #: 168-0045.