Dorman 904-5501 Diesel Exhaust Fluid (DEF) Filler Cap

DEF Filler Cap for OE-Style Replacement

The Dorman 904-5501 diesel exhaust fluid (DEF) filler cap is built to match the fit and function of the original cap on specified vehicles. It is a specific-fit, blue plastic cap designed for reliable sealing and durable everyday use.

For drivers searching for a DEF filler cap for Chevrolet Silverado, GMC Sierra, or other diesel applications, this OE-style replacement helps restore proper tank closure and maintain the original service setup. The Dorman 904-5501 is a direct-fit service part for vehicles that use this style of DEF cap.

Key Features

• Diesel exhaust fluid (DEF) filler cap for emission control service
• Specific-fit design for the original vehicle application
• Blue plastic construction
• Engineered to match the fit and function of the factory cap
• Retention ring included in the package contents
• Part number 904-5501 for easy identification

Detailed Description

This Dorman DEF filler cap is designed for vehicles that require a replacement cap for the diesel exhaust fluid fill point. The cap is made from plastic and finished in blue, matching the common OE DEF cap color used on many diesel vehicles. If you are replacing a damaged or missing DEF cap on a Chevrolet Silverado or GMC Sierra diesel model, part number 904-5501 provides a direct service solution that follows the original fit and function.

Part number 904-5501 also cross-references 572.3006 and 21148728 for the same application. Use this cap when you need a specific-fit DEF filler cap that restores the factory-style closure on the vehicle’s DEF system.

What It Helps Solve

• Broken or cracked DEF filler cap
• Missing cap at the diesel exhaust fluid fill location
• Improper closure of the DEF tank opening
• Replacement needs after cap wear or damage
• Service issues on vehicles requiring a specific-fit DEF cap

Installation Notes and Tips

Install the cap on the matching DEF filler neck for the specified vehicle application. Confirm the cap style, color, and retention-ring setup before installation. For fitment-based searches, verify the vehicle’s year, make, and model against the original DEF cap design before ordering part number 904-5501.

Quality Assurance

Dorman designs this DEF filler cap to match the original cap’s fit and function on specified vehicles. The part is engineered for durability and dependable performance in diesel emission control service.