Mercedes W221 Windscreen Washer Bottle Tank Reservoir Container A2218600360

Mercedes W221 Windscreen Washer Bottle Tank Reservoir Container is an original washer system component designed for installation in S-Class W221 generation models. Thanks to its factory-spec design, it ensures proper supply to pumps and fluid nozzles, stable mounting within the body compartment, and compatibility with factory equipment. Using an OEM component is a sensible choice for washer system maintenance when fitment and maintaining factory performance parameters are a priority.

Specifications and technical data

• SKU: A2218690820
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2218690820
• Substitutable numbers: A2218690820, A 221 869 08 20, A2218600360, A 221 860 03 60
• Category: Washer Pumps, Reservoirs & Nozzles

Purpose and function in the washer system

The presented reservoir is part of the Washer fluid tanks, pumps, and nozzles group, responsible for storing fluid and providing a stable supply to the windshield and headlight washer pumps (if present in the vehicle's specific configuration). The design, tailored to the W221 body, allows for proper hose routing without interference with other components in the engine bay.

The original reservoir ensures:

• adequate working capacity for washer fluid,
• factory mounting points to the body,
• compatibility with original pumps and level sensors (if present in the specific version),
• correct connection ports for fluid hoses.

Benefits of using an original Mercedes reservoir

Using an original reservoir in a Mercedes S-Class W221 allows for maintaining the structural integrity of the washer system. The OEM component is designed for a specific body, which means it:

• eliminates the risk of leaks resulting from poor shape fitment,
• facilitates installation – mounting points and sockets are compatible with factory brackets,
• ensures a stable position of the reservoir even during intensive use,
• reduces the risk of vibrations and noise resulting from improper fitment.

For the user, this means trouble-free operation of the washer system in various weather conditions and no need for system modifications.

Condition, verification, and selection by part numbers

The offered reservoir is a used component, which in practice allows for combining reasonable costs with maintaining the original design. Before installation, it is recommended to perform a standard check of tightness, the condition of the ports, and the sockets for pumps and sensors to ensure the washer system operates stably after replacement.

Selecting this component for a specific version of the Mercedes W221 should be based on the OEM part number and interchangeable numbers assigned to the specific unit. This helps avoid compatibility issues, especially in the case of different equipment versions (e.g., xenon headlights with a separate washer).

Integration with the vehicle system and service aspects

Replacing the washer fluid reservoir in a Mercedes W221 is a typical service operation, most often performed due to mechanical damage, leaks, or corrosion of the mounts. The original component from this offer enables:

• maintaining factory fluid hose routing,
• proper seating of washer pumps in the reservoir sockets,
• trouble-free system bleeding after filling with fluid,
• maintaining aesthetics and order in the body compartment.

For workshops and users, this means shorter installation time and a lower risk of needing additional modifications.

If you are planning a comprehensive repair or upgrade of the area responsible for visibility and windshield cleanliness in your Mercedes and need other elements from the same group, such as additional reservoirs, pumps, or washer nozzles, check the available parts in the Mercedes washer fluid tanks, pumps, and nozzles category.

Technical support and additional knowledge

When selecting consumables and service parts for your car, it is worth using reliable sources of technical knowledge. If you are interested in how to properly diagnose and service other vehicle systems, including fuel supply, the following article will be helpful: Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration. It will allow you to better understand the relationships between individual components and consciously plan service work on your car.