Nalge Nunc Analytical Test Filter Funnels Sterile NALGENE. The squeeze and twist funnel is easy to remove for retrieval of the CN membrane. Specifications for Nalge Nunc Nalgene Analytical Test Filter Funnels: Manufacturer: Nalge Nunc Diameter: 47 mm Features: High impact polystyrene collars are rugged for reliable performance Preassembled sterile individually are bagged to ensure sample integrity Adapters accommodate No. 8 stoppers for use with 0.5in. hole in vacuum manifolds or filter flasks 47mm diameter cellulose nitrate membrane is certified for water quality work 250mL sizes are useful when testing beverages that may foam Cat. No. 147-0045 features gray membrane that turns black when wet making it easier to detect and count growing colonies Package Contents: Nalge Nunc Nalgene Analytical Test Filter Funnels Nalge Nunc Analytical Test Filter Funnels Sterile NALGENE 145-0045