This product is an aluminum thermostat housing designed for 2004-2010 Chevrolet/GMC 6.6L LMM Duramax engines. It is a direct replacement part made from durable stainless steel material, providing a reliable and long-lasting solution for your vehicle's engine cooling system. The thermostat housing is compatible with various GM vehicles and is designed to fit seamlessly, ensuring optimal performance and efficiency. Additionally, it comes with a manufacturer part number for easy identification and installation.