Oil filter are in high quality and performance, easy to control and maintain, have a long service life. Oil filter are in high quality and performance, easy to control and maintain, have a long service life. the specification of the GF air filter:ModelGF200-06GF200-08GF300-08GF300-10GF300-15GF400-10GF400-15GF600-20GF600-25Working mediumAirPort size1/81/41/43/81/23/81/23/41Filter accuracy5 micro ...