Dorman 904-5201CD Diesel Exhaust Fluid (DEF) Filler Cap

DEF Filler Cap Replacement

This Dorman DEF filler cap is a direct-fit replacement for the original cap on specified vehicles. Built for dependable sealing and everyday durability, it helps restore proper closure at the diesel exhaust fluid fill point on applications such as Ford F-250 and Ford F-350 diesel models.

Key Features

• Matches the fit and function of the original diesel exhaust fluid filler cap
• Designed for durable, reliable performance in routine service use
• Includes retention ring in the package contents
• Part number 904-5201CD for easy identification
• Cross-references Monroe Shocks & Struts 572.3003 and 0427757000 for the same application

Product Details

Use this DEF filler cap when the original cap is damaged, missing, or no longer sealing correctly. The cap is engineered to align with OE-style fitment and function, helping maintain a secure closure at the DEF fill opening. For buyers searching for a Ford F-250 DEF filler cap replacement or Ford F-350 diesel exhaust fluid cap, 904-5201CD provides a straightforward service part option.

Common Issues It May Solve

• Broken or cracked DEF filler cap
• Missing cap at the diesel exhaust fluid fill neck
• Loose closure that no longer seats properly
• Worn retention component at the fill opening
• Need for a direct replacement during DEF system service

Installation Notes and Tips

Inspect the fill neck and sealing surfaces before installation. Clean away dirt, crystallized DEF residue, or debris so the cap seats correctly. Confirm vehicle application by year, make, and model before ordering, and verify the part number 904-5201CD against the original cap when replacing a damaged component.

Quality Assurance

Dorman designs this DEF filler cap to match original fit and function on specified vehicles, with construction focused on durability and consistent performance. It is a practical OE-style replacement for diesel service needs.