Cummins 3685173 Front Crankshaft Seal PAI 136139CROSS REFERENCE: 3685173 APPLICATION: Cummins ISX ISX12 ISX15 BRAND: PAI 136139 Cummins 3685173 Front Crankshaft Seal PAI 136139 using engine replacement plus heavy duty engine parts for dependable crankshaft sealing and extended service life. 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 brand new