This Coolant Reservoir Tank is designed to FIT 2013–2020 Peterbilt 579 and is also compatible with T680 and T880 long-wheelbase truck models. Built for durability and easy installation, it helps restore original cooling system performance. Compatible with: – FIT 2013–2020 Peterbilt 579 Coolant Reservoir Tank – Compatible with 2013–2020 T680 Coolant Reservoir Tank – Compatible with 2013–2020 T880 Coolant Reservoir Tank Replaces OE part numbers: DR104002, CP237001, DR104004 Includes: 1 coolant expansion tank with reinforced neck and molded mount points Material: High-strength, chemical-resistant plastic engineered for commercial-grade durability Installation: Direct-fit replacement using factory mounting and hose points. No special tools needed Function: Maintains coolant levels, stabilizes pressure, and prevents engine overheating under load Benefits: Ideal for fleet maintenance, long-haul service, and restoring system reliability in high-mileage vehicles