Perforated Centre Tube (Spiral Type) To Manufacture Low Mean Pore Size Convensional Primary Fuel Oil Filter To Rdso Drg No. Skdp 3931,Alt. Nil And Conforming To Rdso Spec.No.Mp.0.2600.25, Rev.01, July, 2021 Note:All The Materials Parts Must Be Packed In Rigid Hard Card Board Carton Boxes Convenient To Handle.