Dorman 904-066 Diesel Exhaust Fluid (DEF) Filler Neck

Durable Diesel Exhaust Fluid Filler Neck for Ford Super Duty

The Dorman 904-066 Diesel Exhaust Fluid (DEF) Filler Neck is designed to provide a reliable and secure connection for DEF refilling on Ford F-250 Super Duty and F-350 Super Duty trucks. Constructed with a combination of steel, rubber, and plastic materials, this filler neck ensures durability and resistance to harsh conditions.

• Constructed from steel, rubber, and plastic for strength and flexibility
• Measures 29 inches in length, 12 inches in width, and 6 inches in height
• Black color blends with vehicle components for a clean appearance
• Bolt-on attachment method for secure installation
• Compatible with Ford F-250 Super Duty and F-350 Super Duty models

Product Details and Material Composition

The Dorman 904-066 DEF filler neck features a robust steel body combined with rubber and plastic components to withstand exposure to diesel exhaust fluid and environmental elements. The 29-inch length and 12-inch width provide ample reach and fitment flexibility, while the 6-inch height accommodates proper fluid flow. Its black finish offers corrosion resistance and a professional look under the hood. This part does not include a cap or mounting hardware, and it attaches securely using a bolt-on method.

Compatible Vehicles and Applications

This diesel exhaust fluid filler neck is specifically designed for use with Ford F-250 Super Duty and F-350 Super Duty trucks. It is ideal for replacing worn or damaged DEF filler necks to maintain proper emission control system function and fluid containment.

• Replacement for damaged or cracked DEF filler necks
• Prevents DEF leaks and contamination
• Ensures proper DEF fluid delivery to the emission system
• Maintains compliance with emission control requirements

Installation Notes and Tips

Installation requires a bolt-on attachment method; ensure all mounting points are clean and free of debris before securing the filler neck. Since mounting hardware is not included, use existing bolts or source appropriate fasteners. Verify proper alignment to avoid kinks or restrictions in the fluid path.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit, form, and function. The 904-066 DEF filler neck undergoes quality checks to ensure durability and performance. Warranty details are available through Dorman and may vary by distributor.