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NanoSHEILD* Hollow Fiber Series Filter Cartridge^ NanoSHEILD* Hollow Fiber Series Filter Cartridge, Cage and End Caps: Polyethylene, O-ring Material: Fluorocarbon Encapsulated, Fitting Connection: 222 O-Ring and Flat Cap, Increased depth (2x thicker), Reduces hold-up volume, Micron Rating: