This large-volume FastCap™ Bottle Top Filter is made of a polystyrene housing with a 90mm PES membrane and handles up to 5 Liters capacity. FastCap™ Bottle Top Filter's universal fit eliminates the need to screw them onto glass media bottles. CAUTION: Use only sterile bottles designed for use with vacuum. Always use safety shield during vacuum procedures. Just place the filter onto the bottle mouth apply vacuum and start filtering. Fits bottle necks up to 53mm. Filters up to 5L. Housing is blue. WARNING! All Nalgene® Filterware is for research use only not for in vitro diagnosis or parenterals. Material: polystyrene housing with a PES membrane. Capacity: Up to 5 Liters. Membrane diameter: 90mm. Pore size: 0.2µm. Housing color: blue. 10/Case. Nalgene® #: 298-9020.