This 150ml analytical filter funnel is ideal for use with filtering flasks or manifolds. Upper chamber is e graduated at 150ml. Particularly useful for large volume analytical applications (as long as the membrane continues to flow). Convenient snap-away design with removable membrane. Safer and easier to use than cumbersome glass and metal funnels. This product is not intended for use in direct patient care or diagnostic procedures. Each package of 12 filters contains a Nalgene® vacuum gasket to replace a stopper or adapter with 9/16-inch or larger opening. Polypropylene upper polystyrene. Cellulose Nitrate (CN) membrane diameter: 47mm. Pore size: 0.45µm. Membrane color: white gray-gridded. Capacity: 150ml. 12/Pack; 6 Packs/Case. Nalgene® #: 140-4045.