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SFCA (surfactant-free cellulose acetate) membrane filters are much cleaner than standard cellulose acetate and are designed for vacuum filtration with glass media bottles. Use the 0.2µm size for sterilization of aqueous solutions and culture media. Select the 0.45µm size for particle analysis, scintillation counting, prefiltration of aqueous solutions, and general cytology. Polystyrene bottle-top design features molded graduations and a support plate that minimizes foaming and eliminates the need for a separate filter pad. Filter unit screws directly onto media bottles. Yellow collar filter cup is labeled with lot number, catalog number, pore size, and expiration date. Certified radiation-sterilized, nonpyrogenic, and noncytotoxic. The quick-disconnect sidearm accepts 1/4–3/8" tubing. 0.45um 500mL 75mm diameter 33mm neck Case of 12 piecesCase of 12Order your Nalgene MF75 Bottle Top Vacuum Filters 0.45µm 500mL 75mm diameter, 33mm neck and all Nalgene Filters. Worldwide sales of 291-3345, Nalgene MF75 and all Nalgene Filters with wholesale dealer discounts are available. Your worldwide Nalgene Filters dealer and Nalgene Filters distributor!