The Mack And Volvo 5.04 Inch Diameter Exhaust Insulation Jacket is a practical and efficient solution for your exhaust system needs. With a stainless steel construction and a diameter of 5.04 inches, this insulation jacket fits most Mack and Volvo makes and models. It is 3.14 inches long, wide, and tall, ensuring a perfect fit. Designed to meet EPA 10 exhaust emission norms, this jacket is a direct OE replacement for numbers 22983867 and OTR71200121. Improve the performance and efficiency of your vehicle with this high-quality insulation jacket.