Mercedes W470 AdBlue Cap Additive Fuel Tank Filler Cover Cap A2076900064

Visual condition of the part

The product shows signs of use visible in the photos.

Mercedes W470 AdBlue Cap Additive Fuel Tank Filler Cover Cap is an original component from the Fuel filler flaps and caps group, designed for the Mercedes vehicle fuel supply system. It ensures a tight seal for the AdBlue tank, which supports the proper operation of the exhaust gas treatment system and reduces the risk of contaminants entering the installation.

Specifications and technical data

• SKU: A4704708300
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A4704708300
• Substitutable numbers: A4704708300, A 470 470 83 00
• Category: Fuel Tank Caps

Purpose and technical function

Mercedes W470 AdBlue Cap Additive Fuel Tank Filler Cover Cap is a consumable component responsible for the controlled closure of the AdBlue filler neck. A properly selected cap:

• maintains the required tightness of the filler system,
• reduces evaporation and fluid contamination,
• protects against moisture and dirt entering the tank,
• supports the stable operation of the SCR exhaust emission reduction system.

Thanks to the use of a solution compliant with Mercedes factory standards, the cap works with the geometry of the filler socket and the tank design, which translates into secure seating and repeatable closing.

Construction and fitment to the fuel system

The component belongs to the Fuel filler flaps and caps group, which means it has been designed to work in direct contact with the operating medium and variable weather conditions. The cap's design is optimized for:

• stable mounting in the filler socket,
• resistance to AdBlue fluid,
• maintaining sealing parameters over a wide temperature range,
• compatibility with factory body components and filler covers.

The original origin from the Mercedes brand promotes precise fitment with the vehicle's fuel system, without the need for modifications or the use of additional adapters.

Benefits of using an original AdBlue cap

Using a dedicated filler cap in a Mercedes vehicle translates into a number of practical operational benefits:

• Stable AdBlue system operation – reducing the risk of contaminants entering the tank decreases the likelihood of problems with the pump and lines.
• Better protection of fuel system components – proper sealing of the filler supports the long-term efficiency of the components responsible for fluid dosing.
• Compatibility with factory solutions – the cap is designed for specific Mercedes construction solutions, which facilitates installation and daily maintenance.

This solution is particularly beneficial for the maintenance of fleet vehicles and intensively used cars, where operational repeatability and predictable fuel system behavior are important.

Product condition and service application

The offered cap belongs to the group of used parts, which makes it an attractive cost alternative while maintaining compliance with the Mercedes factory specification. This type of component will work well both for standard replacement of a worn cap and for post-accident repairs, when the fuel or AdBlue filler area has been damaged.

In workshop practice, the cap can be used as a replacement part in situations where the existing component no longer provides adequate tightness, has a damaged mount, or does not work properly with the filler flap.

Technical support and part selection

When selecting a cap for a specific vehicle version, it is worth using the manufacturer's markings and service documentation to ensure full compatibility with the fuel system and AdBlue tank. Information on interchangeable numbers, which facilitate the identification of the appropriate variant in parts catalogs, may also be helpful.

To better understand the relationships between the cap, the tank, and other supply components, it is worth referring to the guide material on diagnostics and operation of the fuel system – you can find it in the article Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration.

If you are planning a comprehensive repair or modernization of the fuel and AdBlue filler area in your Mercedes and need other elements from the same group, such as additional caps, flaps, or filler covers, check the available parts in the Mercedes fuel filler flaps and caps category.