The Mack RD 1987 to 2002 Washer Fluid Reservoir Cap is a reliable replacement for an original part that is missing, cracked, or failed due to heat and fatigue. Made from quality materials, this yellow plastic cap is designed to match the fit and function of the original cap on specified vehicles. With a 2.26 inch diameter, 0.37 inches tall, and 1.8 inch inside diameter, it is a snap-on type with a 0.37 inch thickness. Sold individually, this cap is a direct OE replacement number for Volvo 25128543 and fits most Mack RD models from 1987 to 2002. Trustworthy quality is backed by a team of product experts in the United States and over a century of automotive experience.