... cartridge Feature1.Absolute ratings from 0.04µm to 0.45µm 2.Meets bacterial validation per HIMA/ASTM standards 3 ... )-(C)-(D) A:Micron Rating 0.1,0.22,0.45,1,3um B.Length 5",10,20",30" & 40" C ... (225 + Close ) 1S5C (215+ Close ) CSS ( Install Stainless Steel ) D.O Ring S ( Silicon ) E (EPDM) V ( Viton ) N (NBR ) PV (PTFE ...