Audi A4 B9 S4 8W Door Gasket Rubber Strip Seal Rear Left Right N/O/S 8W5833721B

Audi A4 B9 S4 8W Door Gasket Rubber Strip Seal Rear Left Right is a precisely fitted component from the Door seals group, designed for the rear section of the bodywork on either the left or right side. It is responsible for the tightness of the door perimeter, noise reduction, and protecting the interior from moisture and contaminants, which translates into stable acoustic comfort and vehicle usability.

Specifications and technical data

• SKU: 8W5833721B
• Mark: Audi
• Condition: Used
• OEM Part Number: 8W5833721B
• Substitutable numbers: 8W5833721B, 8W5 833 721 B, 8W5 833 721 C, 8W5833721C
• Location on the vehicle: Rear, Right, Left
• Part type: Door Seal
• Category: Door Seals

Purpose and function of the door seal

The presented seal has been designed specifically for the rear body zone of Audi A4 B9 and S4 8W series models, with the possibility of installation on both the left and right sides. Its task is to maintain proper pressure of the door leaf against the body, which helps to limit the ingress of water, dust, and air gusts into the cabin. As a result, the interior remains better insulated from external conditions, and the operation of locks and hinges is less exposed to the influence of atmospheric factors.

Benefits of using an original Audi seal

Using an original seal in the rear part of the body allows for maintaining the factory fit of the doors and predictable behavior of body components during operation. A properly selected rubber profile supports:

• reduction of wind noise and noise from the wheel arch area,
• stable door closing without excessive force,
• protection of sills and lower edges against excessive dirt,
• maintaining proper tightness in the rear seat and trunk area.

For the user, this means more predictable vehicle behavior in daily use and a lower risk of unwanted rattles or resonances in the area of the rear doors.

Placement on the vehicle and assembly aspects

The seal is intended for installation in the rear part of the body, with the possibility of use on the right or left side of the vehicle. This solution facilitates the selection of the component during post-accident repairs or when replacing worn components on one side of the car. The design intended for the specific generation of Audi A4 B9 / S4 8W promotes the maintenance of the correct door perimeter geometry and compatibility with factory mounts.

With proper installation, the seal works with existing body and door trim elements, which helps to reduce the need for additional adjustments. Replacing a worn seal with an original component allows for restoring the original tightness parameters without interfering with the body structure.

Application in service and body restoration

Replacing the seal in the rear part of the body is particularly recommended during body and paint work, after door disassembly, or in situations where the existing element shows signs of wear, such as loss of elasticity or leaks. Using the correct seal helps to reduce the risk of corrosion in the area of the sills and lower door edges, and also improves the acoustic comfort of rear-seat passengers.

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 additional perimeter seals, rabbet seals, or soundproofing elements, check the available parts in the Audi door seals category.

Condition of the element and vehicle selection

The offered seal is a used item, which allows for an economical replacement while maintaining compliance with Audi's factory specifications. Before selection, it is worth verifying compatibility with the specific body version and installation side to ensure proper adhesion to the door edge and body. For vehicles where maintaining the original character and consistency of components is particularly important, comparative materials regarding structural differences between model generations, available in the article Classic Mini vs modern MINI – how the construction has changed and what original Mini parts help preserve their character, may be helpful.