This Puradisc™ 4 syringe filter combines premium quality and economy. These 4mm syringe filters are ideal for the quick efficient filtration of samples up to 2mL volume. They are produced from pigment-free polypropylene plastic for sturdy & reliable filtration. Low hold-up volume of less than 10µL for maximum sample recovery. Applications include: HPLC aqueous sample preparation, Biological sample preparation, Buffer solutions, Salt solutions, Tissue culture media, Irrigation solutions and Sterile isolation. Inlet/Outlet Connections: Female Luer Lock/Male Luer. Membrane: PTFE. Retention: 0.2µm. 500/Pack. Whatman™ #: 6783-0402.