The Freightliner FLD and Columbia Stainless Steel Lower Coolant Tube is a practical and reliable solution for your truck's cooling system. Made from durable 304 stainless steel, this tube is designed to fit most Freightliner FLD and Columbia models with Caterpillar engines and downflow radiators. With its OEM and aftermarket number A05-21600-000, this tube ensures a perfect fit and long-lasting performance. Its sturdy construction guarantees durability, making it a smart choice for truck owners looking for a reliable coolant tube.