0.22 Membrane Filter at Thomas Scientific 0.22 Micron Filter Barnstead (25cm) double open-ended cartridges have 2 Buna-N gaskets for positive seal Pleated membrane has 4.75 sq. ft. (0.46m 2 ) surface area Recommended flowrate: 2 gal./min. (7.5L/min.) Autoclavable at 118°C (245°F) For Use with: Economy Filter Holders 09-034-155, 09-034-156 luer lock ptfe 0.2 micron filter for venting-PTFE