Fits plastic or glass media bottles with 45mm neck sizes. Polyethersulfone (PES) membranes provide the fastest flow rates, the lowest protein binding and low extractables and are best for filtering cell culture media. Angled hose connector simplifies vacuum line attachment. Individually packaged, sterile and certified nonpyrogenic. Each system has the membrane material and pore size printed on the unit and is color-coded by membrane type for easy product identification. Expiration date appears on the filter funnel and shipping boxes. Expiration date of the membrane is three years from the time the product is manufactured.