The Peterbilt D3S 15.91 Inch Exhaust Flex Hose is a reliable and practical solution for your exhaust system needs. With a 5-inch outer diameter and 4-inch inner diameter, this stainless steel hose is built to last. It is sold individually and made in the USA, ensuring high-quality craftsmanship. This hose is directly replaceable with OE parts, making installation hassle-free. Clamps and gaskets are included for added convenience. Designed to fit most Peterbilt makes and models, it is a versatile choice. With direct OE replacement numbers of 21428534 and OTR82530, this exhaust flex hose is a dependable and environmentally friendly option.