The Peterbilt 2006 and Newer Diagnostic Plug Cover is a practical and durable solution for protecting your diagnostic plug. Available with a diamond or indent design, the diamond option comes in blue, green, red, and clear. Sold individually, this cover is a cost-effective way to keep your diagnostic plug safe and secure. With its variety of color options and sturdy construction, this plug cover is a must-have for any Peterbilt owner looking to protect their vehicle's diagnostic system.