The Peterbilt 357, 359, 377, 378, and 379 Stainless Steel Upper Coolant Tube (OEM Number 05-19903) is a durable and practical solution for your Peterbilt truck. Made from 304 stainless steel, this coolant tube is built to last. It fits most Peterbilt 357, 359, 377, 378, and 379 models with Cummins ISX engines. Whether you need a replacement for your OEM tube or want to upgrade to a more reliable option, this coolant tube is the perfect choice. With its OEM and aftermarket numbers (05-19903 and 0519903), you can trust in its quality and compatibility.