The DORMAN-HD solutions non pressurized coolant reservoir is engineered for Mack models, ensuring proper fit and compatibility. Constructed from heat-resistant plastic, it effectively prevents leaks and endures extreme engine temperatures. Its transparent design allows easy inspection of coolant levels at a glance, complemented by integrated level markers for quick and accurate fluid monitoring. The reservoir's rugged construction bolsters its durability, making it resilient against vibrations and challenging road conditions, maintaining its performance over time.