Cummins ISX/QSX 3691476 Crankcase Breather Filter PAI 050518CROSS REFERENCE: 3691476 APPLICATION: Cummins ISX QSX Multiple Use Application. BRAND: PAI 050518 Cummins 3691476 Crankcase Breather Filter PAI 050518. Heavy duty and diesel truck. Maintains airflow and supports consistent crankcase pressure control. All components are proudly manufactured in the U. S. A. by PAI Industries Inc., an ISO9001 certified company with over 50 years of experience in the heavy duty truck parts industry. This part is built