... , 2. compact and space-saving design This filter has four series,"*" stands for different classes, ... 0.01μm,bottom oil≤0.01ppm;class 3: accurary: 0.01μm,bottom oil≤0.001ppm;class 1: active carbon filter,bottom oil≤0 ... * -22#3.8G1 1/2"378110F* -37#6.5G1 1/2"378110F* -45#8.5G2"550150F* ... filter only equip with manual drain, if need other accessories like above table, need extra charges. compressed air filter ...