Dorman's Auto Trans Oil Cooler Thermostat Housing has improved durability and resistance. It withstands the extreme changes in temperature that frequently cause housing to become brittle, crack and leak. For optimum transmission performance replace now to maintain the steady flow of coolant through the transmission cooler. Recommended to replace when replacing expansion tank. Product Features:Direct replacement for a proper fit every timeHoses slide on for easy installationHigh-quality constructionIncludes thermostat and housing for complete repair