Mercedes-Benz C E W204 W212 Washer Bottle Filler Neck Pipe Cap A1718690108

Visual condition of the part 

The product shows signs of use visible in the photos. 

Mercedes-Benz C E W204 W212 Washer Bottle Filler Neck Pipe Cap is an original washer system component designed for use in popular C-Class and E-Class models. Thanks to its factory-fit design for the fluid supply system, it ensures a tight seal and stable operation of the entire system. This is a practical solution for users looking for a proven OEM component instead of random aftermarket replacements.

Specifications and technical data

• SKU: A1718690108
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1718690108
• Substitutable numbers: A1718690108, A 171 869 01 08, BG
• Category: Washer Pumps, Reservoirs & Nozzles

Purpose and function in the washer system

The washer cap is responsible for securely closing the fluid reservoir and maintaining the proper pressure within the system. In Mercedes C-Class W204 and E-Class W212 vehicles, it works with components from the Washer fluid reservoirs, pumps, and nozzles group, creating a cohesive system for delivering fluid to the windshield or headlights. A properly selected cap reduces the risk of leaks, prevents contaminants from entering the reservoir, and avoids issues with washer pump operation.

Advantages of using an original Mercedes washer cap

Choosing an original Mercedes component allows you to maintain the factory performance parameters of the washer system. The element has been designed for specific diameters, shapes, and reservoir mounting methods, which translates into:

• secure, stable seating on the reservoir,
• proper system sealing under typical operating loads,
• compatibility with factory reservoirs and washer equipment,
• reduced risk of leaks resulting from the use of random replacements.

For users who expect predictable washer system performance in various weather conditions, using an original cap is a technically safe and economically justified solution.

Condition of the part and installation aspects

The offered washer cap is a secondary market part, which allows for lower repair costs while maintaining OEM specifications. This is a practical proposal for drivers who want to restore full functionality to the washer system without investing in more expensive, new components. In most cases, installation is limited to placing it on the factory reservoir, without the need to interfere with other system components.

Compatibility and selection based on technical data

The selection of a washer cap for a specific Mercedes C-Class W204 or E-Class W212 should be based on the vehicle's technical data and the part manufacturer's markings. The product has assigned catalog numbers and interchangeable numbers, which facilitates verification of compatibility with a specific body version and equipment level. In case of doubt, it is worth comparing the markings with service documentation or the existing part installed in the car.

If you are planning a comprehensive repair or upgrade of the washer system area in your Mercedes and need other elements from the same group, such as fluid reservoirs, supply pumps, or spray nozzles, check out the available parts in the Mercedes washer fluid reservoirs, pumps, and nozzles category.

Technical support and additional knowledge

When selecting consumables for modern cars, it is useful to know how to identify parts by catalog numbers and VIN. A detailed discussion of component selection methods, regeneration, and operating principles can be found in the article Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration, which organizes key issues related to the operation of supply systems and the selection of OEM parts.

If you are considering whether a new replacement or a secondary market part is a better choice in your case, comparing costs and durability described in the material New or used? A comparison of costs and quality of car parts may be helpful. This will allow you to make an informed decision on whether a used washer cap will be the optimal solution for your car.