Polystyrene funnel with polyethylene neck adapter is designed for use with Wide-mouth (45mm) polystyrene or glass storage bottles. All bottle-top filters are color-coded and printed with the membrane Type and Pore size for easy identification. Ideal for filtering cell culture media, biological fluids, and aqueous solutions large membrane diameters (50, 70, and 90mm) and glass prefilters increase flow rates. Provided sterile and certified Nonpyrogenic