The Peterbilt Stainless Steel Upper Coolant Tube is a reliable and practical solution for your Peterbilt 357, 359, 377, 378, and 379 models with Caterpillar ACERT engines. Made from durable 304 stainless steel, this coolant tube is built to last. It fits seamlessly into your vehicle's cooling system, ensuring optimal performance and preventing leaks. With OEM and aftermarket numbers F66-6151 and F666151, this coolant tube is a perfect replacement for your worn-out or damaged part. Invest in this high-quality product to keep your engine running smoothly and efficiently.