Primo Diesel Air Filter Red 6.0 x 7.75 x 9.0 x 7.0 Inch Conical VolantDiesel engines operate differently from gas engines requiring greater air volume than gas engines. In order to achieve adequate airflow diesel engines create a tremendous amount of suction and under certain conditions are capable of collapsing poorly built filters. To meet the unique demands of diesel engines, Volant Primo filters are designed with 8 Layers of filtration and heavy duty filter mesh that adds structural integrity to prevent filter