Mercedes W177 Adblue Filler Neck Cap Pipe Hose Additive Line A1774703300

The AdBlue filler neck and cap for Mercedes W177 is an original component of the AdBlue additive system, belonging to the Hoses, pipes and tubes category. It ensures a sealed and stable connection between the filler neck and the additive system, which is crucial for the proper functioning of the exhaust gas purification system in modern Mercedes diesel engines.

Specifications and technical data

• SKU: A1774703300
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1774703300
• Substitutable numbers: A1774703300, A 177 470 33 00
• Category: Hoses, Lines & Pipes

Purpose and Technical Function

The presented AdBlue filler neck and cap hose is specifically designed for Mercedes W177 generation A-Class models equipped with a factory-installed Selective Catalytic Reduction (SCR) system. This component is responsible for safely directing AdBlue fluid from the filler neck to the rest of the system, minimizing the risk of leaks and spills.

Thanks to its factory geometry and proper profile, the hose maintains adequate flow and resistance to typical operational stresses, such as temperature changes, body vibrations, or frequent cap operation during fluid refills.

Construction and AdBlue System Fitment

The original design of the hose and filler cap is adapted to the factory mounting points in the W177 body, facilitating installation and allowing for the preservation of the original AdBlue line routing. The materials used are resistant to urea-aqueous solution, reducing the risk of material degradation over time.

The component is designed to:

• ensure a sealed AdBlue filler neck,
• maintain a stable connection with the rest of the additive system,
• preserve compatibility with factory brackets and covers in the Mercedes W177.

Benefits of Using an Original Hose

Using an original hose and filler cap to replace a worn or damaged component helps to mitigate common operational issues related to the AdBlue system, such as error messages, system airlocks, or uncontrolled fluid leaks. Factory fitment ensures the correct positioning of the hose relative to the body and other components, which is particularly important in the tightly packed rear section of the vehicle.

A used OEM part is a cost-effective solution that also maintains consistency with the vehicle's original design, without the need for modifications or the use of universal aftermarket parts.

Condition and Service Application

The offered AdBlue filler neck and cap hose is a used part intended for service applications in Mercedes W177 vehicles where mechanical damage, hose cracking, cap sealing issues, or interference with the filler system has occurred. Replacement of this component is recommended wherever there are signs of fluid crystallization around the filler neck, difficulties in closing the cap, or visible damage to the hose.

Expanding the AdBlue System in Mercedes

If you are planning a comprehensive repair or upgrade of the AdBlue system area in your Mercedes and require other parts from the same category, such as additional hoses, supply lines, or return pipes, check the available parts in the Mercedes Hoses, pipes and tubes category.

For users interested in a broader perspective on the operation of this brand's diesel engines, including the impact of a functional fuel system and accessories on engine performance, an article describing the refresh of the popular 3.0 V6 CDI engine may be helpful – Second life for the Mercedes OM642 engine – how injectors and turbocharger restore power to the 3.0 V6 CDI.