Round PFT Filter for Collins DC-2Round PFT Filter for Collins DC-2SKU: 5556100$137.50PriceShipping Terms PolicyQuantity*Add to CartFilter Specifications Bacterial Filtration Effeciency 99.99% Viral Filtration Effeciency 99.99% Dead Space Approx. 35ml (cc) Resistance 0.23 cm H2O/L/sec approx. Material K resin case Electrostat® fitrate medium Nelson Labs Test Results