Brand New Dayton Parts 419-1007 Heavy Duty Belt Tensioner Up for sale is a premium, heavy-duty automatic serpentine belt tensioner assembly. This is a commercial-grade fleet replacement part designed to maintain correct belt tension and maximize belt life under extreme loads. Condition Note: The tensioner itself is 100% brand new, flawless, and completely factory-sealed inside its clear protective wrap. The outer cardboard retail box is distressed and has tearing from warehouse storage, but the component inside is fully protected and pristine. Product Details: • Brand: Dayton Parts • Part Number: 419-1007 • Fitment Application: Commonly fits Volvo D13 and Mack MP8 Diesel Truck Engines. Please confirm your vehicle layout or verify with your fleet technician using part number 419-1007 to ensure accurate compatibility before purchasing.