The Peterbilt 2008 to 2010 Heavy Duty Washer Fluid Reservoir Cap is a matte black plastic cap that easily snaps on. Sold individually, this cap is a direct replacement for cracked or lost original caps. It is application specific, designed to match the dimensions of the reservoir cap on certain vehicle years, makes, and models. With a seamless fit, this cap is reverse-engineered from the original equipment to ensure a perfect fit. Offering excellent value, it is a quick and affordable replacement option compared to dealership alternatives. Compatible with most Peterbilt models from 2008 to 2010, this cap has a direct OE replacement number of Paccar C5720S.