PTFE Syringe Filters, 0.45 um, 13mm, Luer-Lok/Luer Slip, Sterile, 100 per pack, SF14473. Regular Price: $118.78. Price $103.29. Add To Cart. PTFE Syringe Filters, 0.45 um, 25mm, Luer-Lok/Luer Slip, Sterile, 100 per pack, SF14475. Regular Price: $134.54.