This apparatus is made of stainless steel. It has complete systems for aseptically filtering liquid samples. The sterility tests in these systems are done by the bacteria-retentive membranes filter method. A 47 mm membrane filter is installed in a suitable holder. The liquid sample is drawn through this sterile membrane filter to concentrate any contaminating fluid is passed into the funnels, rinsing all sample residues through the filters so the filter is sectioned and aseptically transferred to media for culturing. If growth is not visible after the incubation period, the sample passes the test.