Dorman’s Diesel Emissions Fluid (DEF) Filler Cap effectively prevents diesel exhaust fluid from leaking or spilling through the filler neck. Integral for helping to keep pollutants out of the environment, replacement restores the diesel emissions fluid system to proper operation. .  

• A necessary replacement item for passing inspection in certain states
• Constructed from high- quality, heat-resistant materials for a long service life
• Direct replacement for a proper fit
• Vehicle try-on testing and vibration testing have been conducted on this part to ensure trouble-free performance
• Application Summary: Kenworth (2010+), Peterbilt (2010+)