Sartorius Minisart™ SRP Syringe Filters are single-use filtration units with a chemically resistant PTFE membrane and male luer slip outlet. Available in 4, 15 and 25mm diameter filters with 0.2 or 0.45 μm pores. X50 Minisart PTFE 0.45um 25mm, non-sterile, PP, Male Luer Slip, White, Printed. Pricing and Availability.