Each filter has a female Luer-lock inlet and a male slip Luer outlet.. Ideal for sterile filtration. Manufacturing process certified to ISO 9001. Biosafe according to Class VI plastics tests. . . VWR 28145-501 Syringe Filters with Acrylic Housing Sterile Sterile, 0.2µm Pore Size, 25mm Diameter, Pack of 50. Country of Origin : United States.