Sterile filter units with 90 mm diameter SFCA (surfactant-free cellulose acetate) membrane. Vacuum device designed to filter volumes over 200 ml of whole serum. 500 ml upper and receiver. With 1-1/2 turn threaded screw closure to eliminate pH shift in receivers. Side-arm features a cellulosic vent plug and a quick-disconnect tubing adapter. Non-pyrogenic. Tubulation accepts tubing 1/4 to 3/8"" ID. Guaranteed leakproof.