Cummins ISB/QSB 3968183 Exhaust Valve PAI 192153 (Pack2)CROSS REFERENCE: 3968183 4089672 APPLICATION: Cummins ISB QSB BRAND: PAI 192153 Cummins 3968183 Exhaust Valve PAI 192153. Truck engine parts and heavy duty engine parts. Maintains exhaust valve function for consistent engine performance and durability. 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