Nalgene Rapid-Flow Sterile Disposable Filter Units. Upper chamber separates from receiver for easy access to filtrate. 1.5-turn sterile polyethylene leakproof screw closure eliminates pH shift in receiver. Receiver is an ideal filtrate storage vessel/ Padless membrane support minimizes foaming of proteinaceous samples. Nonpyrogenic. Gamma radiation sterilized. Individually wrapped for a five-year sterile shelf life. Low extractables and naturally hydrophilic. Contains no wetting agents and is alcohol resistant. Upper 250ml. Receiver 250ml. Membrane Nylon. Pore Size 0.2 µm. Diameter 50mm. Pack Qty 12. Type Filter Unit.