Audi A8 D4 Sunroof Sun Roof Drain Hose Water Drainage Pipe Hose Line 4H0877203B

Audi A8 D4 Sunroof Sun Roof Drain Hose Water Drainage Pipe Hose Line is an original water drainage system component, designed specifically for the roof structure of this model. Thanks to its precise profile and fitment to factory mounts, it ensures stable water drainage from the sunroof cassette, minimizing the risk of moisture entering the vehicle interior. Using an OEM component is a sensible choice for professional repair of the drainage system in an Audi.

Specifications and technical data

• SKU: 4H0877203B
• Mark: Audi
• Condition: Used
• OEM Part Number: 4H0877203B
• Substitutable numbers: 4H0877203B, 4H0 877 203 B
• Category: Hoses, Lines & Pipes

Function and application of the sunroof drain hose

This hose belongs to the Lines, hoses and pipes category, responsible for the controlled drainage of water from the sunroof area. A correctly installed hose directs water from the cassette channels outside the cabin, which reduces the risk of:

• leaks in the area of the pillars and headliner,
• fogged windows caused by excessive moisture,
• pitting corrosion in the sill and floor area.

Choosing an original hose dedicated to the Audi A8 D4 allows for maintaining the factory geometry of the drainage line routing and compatibility with standard body mounts and grommets.

Construction and fitment for the Audi A8 D4

The sunroof drain hose has been designed by the manufacturer with a specific routing in the Audi A8 D4 body in mind. This means that:

• its length and shape are adapted to the factory sunroof cassette,
• the hose ends work with the original drainage spigots,
• the hose routing does not interfere with the electrical installation or interior trim elements.

Such fitment limits material stress during body movement and reduces the risk of micro-cracks that could appear when using universal replacements.

Benefits of using an original Audi hose

Using a used, original drain hose in an Audi A8 D4 is a practical solution when repairing the sunroof system. Key advantages include:

• Factory geometry – the hose maintains the original routing, which facilitates installation and service.
• Body compatibility – no need for modifications to mounts or seals.
• Consistency with other system components – the hose works with standard channels, spigots, and grommets.

Thanks to this, the repair of the sunroof water drainage system is predictable, and the risk of recurring leaks after installation is minimized.

Service purpose and installation

The Audi A8 D4 Sunroof Sun Roof Drain Hose Water Drainage Pipe Hose Line is suitable for both local leak repairs and larger service work within the roof area. The component is intended for installation in place of a worn or damaged hose, which may show:

• cracks caused by material aging,
• crushes restricting water flow,
• leaks at connections with the cassette or body drain.

Replacing it with an original hose allows for restoring proper system patency and reduces the need for additional modifications during installation.

If you are planning a comprehensive repair or upgrade of the roof water drainage zone in your Audi and need other components from the same group, such as lines, hoses, or drain pipes, check the available parts in the Audi lines, hoses and pipes category.

If you are interested in the broader context of the cost-effectiveness of using original, used components in vehicle systems, it is worth reading the article Humming differential? Find out why a used OEM drive axle is a better investment than an uncertain replacement, which shows why OEM parts are often a more predictable service choice.