Syringe Filter, PTFE, 25mm diameter, 0.45um, 25 - amazon.com
Simsii Syringe Filter, Nylon Membrane, Non Sterile Lab Disc, Diameter 25mm, Micron Pore Size 0.22 Micron,Disc Shape Blue Corded,PP Housing,Luer Lock,100 of Pack, 4.2 out of 5 stars 4 $63.00