Nonwoven Disc Filter Bags For Gf 1/2 Filter As Per Drg. No. Nalco/P&D/M 190/,Non Woven Disc Filter Bag For Dorr Oliver Filter As Per Drawing Nalco/Oprn/3027/Rev 1,Non Woven Disc Filter Bags For Bokela Filters As Per Drawing No. Nalco/Oprn/62/Rev 0,Nonwoven Disc Filter Bag Gf 4 Filter As Per Drawing No Nalco/Opr/5739/Rev 0