... (5) Port Size: Mini-1/8", 1/4", 3/8"; Midi-1/4", 3/8", 1/2", 3/4"(6) Min. ... alloy; Adjusting knob: POM Sealing: NBR;2. OU- Mini- FR.L(Filter.Regulator&Lubricator)All Model: OFR-1/8 ... -Mini, OFR-1/4-Mini, OFR-3/8-MiniSelection CriteriaOrdering exampleModel: OFR-1/4 ... --MiniOFR-Mini-F.R(Filter&Regulator), Port Size 1/4" OFR-3/8-Mini Festo Air Filter&Regulator