The Peterbilt 37 Series Stainless Steel Upper Coolant Tube is a durable and reliable product designed for Peterbilt 37 models with Caterpillar 3406 engines. Made from high-quality 304 stainless steel, this coolant tube offers exceptional strength and longevity. It is sold individually and fits seamlessly into your vehicle's cooling system. With its OEM and aftermarket number of 07-06508 and 0706508, this coolant tube is a practical and efficient solution for maintaining optimal engine performance.