This Peterbilt Stainless Steel Lower Coolant Tube is designed to fit most Peterbilt 357, 359, 377, 378, and 379 models with Caterpillar ACERT engines. Made from durable 304 stainless steel, this tube is built to last and is sold individually. It is a direct replacement for OEM number F66-6152 and aftermarket number F666152. Upgrade your vehicle's cooling system with this reliable and practical component.