Dorman 904-5502CD Diesel Exhaust Fluid (DEF) Filler Cap

DEF Filler Cap for OE-Style Replacement

The Dorman 904-5502CD diesel exhaust fluid filler cap is built to match the fit and function of the original cap on specified vehicles. It is a direct replacement choice for maintaining a secure DEF tank closure on diesel applications, including Chevrolet Silverado and GMC Sierra models where this part number applies.

• Diesel exhaust fluid (DEF) filler cap replacement
• Matches original cap fit and function on specified vehicles
• Built for durable, reliable service in diesel emission systems
• Package contents include a retention ring
• Part number 904-5502CD for easy identification

Detailed Product Overview

Use the Dorman 904-5502CD when the original DEF filler cap is damaged, missing, or no longer sealing properly. This cap is designed for emission-control service and helps restore the factory-style closure at the DEF fill point. It is a practical replacement for Chevrolet Silverado and GMC Sierra diesel trucks that require this application, and the 904-5502CD cross-references Monroe Shocks & Struts 572.3001 and 21148725 for the same application.

Common Problems This Part Can Address

• Broken or cracked DEF filler cap
• Missing cap at the diesel exhaust fluid fill location
• Loose closure at the DEF tank opening
• Contamination risk from an uncovered DEF fill point
• Need for an OE-style replacement cap on Chevrolet Silverado or GMC Sierra trucks

Installation Notes and Tips

Confirm the vehicle application before installation and compare the original cap and retention ring to the replacement part. Clean the fill area before installing the cap, then verify that the cap seats fully and the retention ring is secured. For fitment-based searches, this part is used on specified Chevrolet Silverado and GMC Sierra diesel applications; verify the exact model and year before ordering the 904-5502CD.

Quality Assurance

Dorman designs this DEF filler cap to match original equipment fit and function and to provide dependable performance in diesel emission-control use.