The Western Star Stainless Steel Lower Coolant Tube is a durable and reliable product designed for Western Star models with Caterpillar 3406E, C15, and C16 engines. Made from high-quality 304 stainless steel, this coolant tube offers exceptional strength and longevity. It is sold individually and fits most Western Star models. With OEM and aftermarket numbers 20404-3481 and 204043481, this coolant tube is a practical and efficient solution for maintaining optimal engine performance.