Polytetrafluoroethylene PTFE Syringe Filters, 0.22um, 4mm, Luer-Lok/Luer Slip, Sterile, 100 per pack, SF18243. Regular Price: $112.13. Price $97.50. Add To Cart. PTFE Syringe Filters, 0.22 um, 25mm, Double Luer Lock, PP Housing, sterile, 1000 per pack, SPEC18137. Regular Price: $2,494.00.