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The product is an Engine Coolant Reservoir-Recovery Tank by Dorman (OE Solutions) with a manufacturer part number of 603-487. It is designed for use in vehicles as a coolant overflow reservoir, helping to manage and regulate the flow of coolant in the engine cooling system. This component is essential for maintaining proper engine temperature and preventing overheating issues. Perfect for replacement or repair in various car and truck models, this Dorman coolant reservoir ensures efficient coolant storage and distribution for optimal engine performance.