Best Sellers Particle Retention Format Grade Price: Lowest Price: Highest Set Ascending Direction. PTFE Syringe Filters, 0.22 um, 33mm, Luer-Lok/Luer Slip, Sterile, 100 per pack, SF14476. Regular Price $206.08 Price $179.20. Add to Cart. Add to Wish List. PTFE Syringe Filters, 0.22 um, 33mm, Luer-Lok/Luer Slip, Nonsterile, 100 per pack, SF16002.