Mercedes R172 Rear Door Window Seal Gasket Rubber Inner Right O/S A1726700438

Mercedes R172 Rear Door Window Seal Gasket Rubber Inner Right O/S is an original component from the Window seals and trims group, designed for installation on the right side of the rear bodywork. It ensures a tight window guide, reduces wind noise, and supports the proper operation of the window lifting and lowering mechanism in your Mercedes.

Specifications and technical data

• SKU: A1726700438
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A1726700438
• Substitutable numbers: A1726700438, A 172 670 04 38, A 172 670 08 38, A1726700838
• Location on the vehicle: Rear, Right
• Part type: Inner Beltline Seal
• Category: Window Seals, Gaskets & Trims

Purpose and function of the seal

The presented seal is designed for installation in the rear right door area, on the inner side of the window. Its function is to:

• provide stable window guidance in the track during opening and closing,
• limit the ingress of water and contaminants into the door interior,
• reduce cabin noise by sealing the contact point between the window and the frame,
• protect the window edge against excessive mechanical wear.

Thanks to its fitment to the specific geometry of the Mercedes R172 body, the seal maintains the correct contact line, which translates into stable window operation and predictable behavior of the entire mechanism.

Original origin and fitment for Mercedes R172

The seal comes from the Mercedes product range, which ensures factory manufacturing standards and compatibility with the door structure of the R172 model. The original mounts and seal profile allow for installation without modifications, maintaining:

• proper fitment with the door frame and window,
• compliance with factory mounting points,
• a consistent appearance with other trim elements.

This solution is particularly beneficial for post-accident repairs or when replacing worn-out components, where you want to maintain the original body structure and proper window operation.

Characteristics of the used component

The seal is offered as a secondary market component. This means it comes from disassembly, and its condition corresponds to normal vehicle usage. This type of part is a good choice when the priority is to maintain the original specification while optimizing repair costs.

In practice, a used seal from original production often provides a better fit than cheaper replacements, which is important for door tightness, acoustic comfort, and the durability of the window lifting mechanism.

Application in repairs and restorations

Mercedes R172 Rear Door Window Seal Gasket Rubber Inner Right O/S will work well both for a local replacement of a single element and for broader bodywork and paint repairs in the rear part of the vehicle. It is particularly useful when:

• the original seal has been mechanically damaged (e.g., during a collision or window removal),
• there are leaks, wind noise, or water entering the door interior,
• it is necessary to replace a set of seals in the doors on one side of the vehicle.

If you want to better understand when it is worth choosing parts from disassembly instead of replacements, the following article will be helpful: Post-accident repair of your car: why used body parts are a better choice than replacements?.

Expanding repairs within windows and trims

If you are planning a comprehensive repair or upgrade of the door glazing area in your Mercedes and need other components from the same group, such as additional guide seals, window trim strips, or inner pressure strips, check the available parts in the Mercedes window seals and trims category.