PTFE Syringe Filters, 1 um, 4mm, Luer-Lok/Luer Slip, Nonsterile, 200 per pack, SF17030. Regular Price $172.98 Price $156.44 As low as $140.80. Add to Cart. Add to Wish List. PTFE Syringe Filters, 0.45 um, 13mm, Luer-Lok/Luer Slip, Sterile, 100 per pack, SF14473.