Description
This thermostat is designed to regulate engine temperature efficiently in Cummins 5.9L ISB, 4.5L QSB, and B-Series engines. It opens at 180_ to ensure optimal cooling performance, preventing overheating and maintaining fuel efficiency. This is a direct replacement for OEM part numbers 5292708 and 3974823, ensuring a precise fit and reliable operation. Built from durable materials for long-lasting performance






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