Direct-fit Thermostat 150℉ for Cummins K19 K38 K50 QSK. Main part code: 3349225. Compatible with replacements . Constructed from durable materials to handle daily stress and high temperatures. Delivers consistent performance and reduces downtime from part failure. Suitable for trucks, generators, marine engines, and industrial equipment. A reliable, affordable replacement that supports your engine lifespan and efficiency. It offers stable performance and long-term reliability for your Cummins engine.