Mack 744GB53 Coolant Hose PAI 8729CROSS REFERENCE: 25501933 744GB53 APPLICATION: Mack E 7 Aset E Tech Multiple Use Application. BRAND: PAI 8729 Mack 744GB53 Coolant Hose PAI 8729. Heavy duty truck parts and diesel truck parts. Maintains coolant transfer and supports consistent temperature regulation under load. 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