Mack/MP 20938963 Exhaust Manifold Seal Gasket PAI 831027 (Pack2)CROSS REFERENCE: 20938963 21475172 7420883450 APPLICATION: Mack MP7 MP8 Volvo D11 D13 Multiple Use Application. BRAND: PAI 831027 Mack 20938963 Exhaust Manifold Seal Gasket PAI 831027 featuring truck engine parts and diesel engine parts. Provides consistent sealing with stable long term performance. 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