Audi A4 B9 Rear Inner Seal Rubber Gasket Left Right N/O/S 8W5833721C

Audi A4 B9 Rear Inner Seal Rubber Gasket Left Right is an original component from the Door seals group, designed for the rear body section of Audi models. The precisely fitted sealing profile helps reduce noise, improve cabin acoustic comfort, and maintain proper door tightness during daily use. Thanks to its factory geometry, it is a practical solution for post-collision repairs, replacing corroded components, or restoration work.

Specifications and technical data

• SKU: 8W5833721C
• Mark: Audi
• Condition: Used
• OEM Part Number: 8W5833721C
• Substitutable numbers: 8W5833721C, 8W5 833 721 C
• Location on the vehicle: Rear, Right, Left
• Category: Door Seals

Purpose and vehicle placement

The presented seal is designed for installation on the rear axle of the vehicle, on the left or right side, allowing for flexible use in various body repair scopes. Its placement in the inner door zone means the component is responsible for sealing the contact between the door panel and the body, contributing to:

• limiting the ingress of water and moisture into the interior,
• reducing wind noise at higher speeds,
• stable door closing without excessive play.

Technical and functional characteristics

As a part from the Audi brand, the seal has been designed to maintain factory sealing parameters and ride comfort. The properly selected compound hardness and working profile work in harmony with the door and body edges, which translates into predictable component behavior during operation. The product has a dedicated OEM part number and associated interchangeable numbers, which facilitates compatibility verification with a specific Audi A4 B9 configuration.

The placement described as Rear, Right, Left allows the seal to be used on both the driver and passenger sides, which is particularly useful for comprehensive replacement of sealing elements in the rear part of the vehicle.

Benefits of using an original Audi seal

Using an original inner door seal in an Audi A4 B9 allows for maintaining the structural integrity of the body and predictable door behavior during opening and closing. Key advantages include:

• Factory fit – shape and length compatibility with the original component installed in the Audi A4 B9.
• Stable sealing parameters – proper performance within the temperature range typical for vehicle operation.
• Compatibility with factory mounts – no need for modifications or fitting universal replacements.

This approach facilitates maintaining proper acoustic comfort and reduces the risk of unwanted rattles or play within the door area.

Product condition and service application

The item is offered as used, making it a reasonable choice for post-accident repairs, replacing localized damage, or budget restoration of the rear body section. In practice, it will prove useful both in body and paint workshops and for users self-servicing their Audi A4 B9 who expect an original component at a more favorable price than a new replacement.

Additionally, the product has an assigned SKU, which facilitates clear identification in warehouse systems and for online orders.

Expanding the scope of repairs – Audi door seals

If you are planning a comprehensive repair or upgrade of the door zone in your Audi and need other elements from the same group, such as front inner seals, outer door profiles, or additional edge buffers, check the available parts in the Audi door seals category.

If you are interested in a broader context of operation and repair of components in modern power units, it is worth checking out practical tips regarding engine accessory regeneration, which you can find in the article Second life for the Mercedes OM642 engine – how injectors and turbochargers restore power to the 3.0 V6 CDI.