Dorman 603-5751 Non-Pressurized Engine Coolant Reservoir with Cap

The Dorman 603-5751 is a direct-replacement, non-pressurized engine coolant reservoir engineered for heavy-duty commercial truck applications. Manufactured from durable plastic, this overflow reservoir is built to handle the demanding conditions of underhood heat and constant engine vibration, delivering reliable coolant storage and overflow management for the life of the vehicle.

As a Dorman HD Solutions product, the 603-5751 is precision-engineered to match the fit and function of the original equipment part it replaces, making installation straightforward with no modifications required.

Key Features:

• Direct OE replacement — matches original fit, form, and function
• Non-pressurized design for compatible cooling systems
• Constructed from high-quality plastic to resist underhood heat and vibration
• Includes cap — complete, ready-to-install solution
• White finish for easy coolant level visibility
• Backed by Dorman's century-long automotive aftermarket expertise

The Dorman 603-5751 is part of the Dorman HD Solutions lineup, designed specifically for medium- and heavy-duty vehicle applications. This coolant overflow reservoir ensures your engine's cooling system maintains proper fluid levels, helping to prevent overheating and protect critical engine components.