The Peterbilt 387 Stainless Steel Lower Coolant Tube is a durable and reliable product designed for Peterbilt 387 models with Caterpillar 3406E, C15, and C16 engines. Made from high-quality 304 stainless steel, this coolant tube offers superior strength and longevity. It is sold individually and fits perfectly with OEM number F66-6178 and aftermarket number F666178. With its practical construction and compatibility, this coolant tube ensures efficient cooling system performance, making it an essential component for your Peterbilt 387.