The Mack Heat Shield Cap is a practical and beneficial product designed for CHU/CXU Models. Made of stainless steel, this plain cap replaces the black OE cover that hides the diesel particulate filter. It is sold individually and can be easily fastened using existing hardware on the passenger side. With its compatibility with most Mack CHU and CXU models, this heat shield cap ensures the protection and longevity of your vehicle's diesel particulate filter.