This 500mL Rapid-Flow™ series filter unit consists of a polystyrene housing and a PES membrane. The 75mm diameter membrane provides a faster flow rate. Ideal for biological and pharmaceutical sterilization requirements it has graduations on both uppers and receivers. Also has a side-arm with a cellulosic vent plug and quick-disconnect tubing adapter and comes with a leakproof threaded closure for receiver. This product is not intended for use in direct patient care or diagnostic procedures. Blue collar. Capacity: 500mL upper and receiver. Material: polystyrene housing with a PES membrane. Membrane diameter: 75mm. Pore size: 0.45µm. 12/Case. Nalgene® #: 166-0045.