VacuCap PF Bottle-Top Filters Sterile For volumes of 1 to 5L. Hydrophilic polyethersulfone membrane. 90mm diameter. 0.8/.2um pore size. Polyester membrane support. Filtration area is 60cm2. Acrylic housing. With built-in prefilter and one piece of tubing per ten filter devices. 10/pk.