BMW E81 E82 X1 E84 E87 E90 E91 E92 Filler Pipe Neck Wash Container Cap 7075099

BMW E81 E82 E84 E87 E90 E91 E92 Washer Fluid Reservoir Cap is an original BMW Group part, designed for the factory washer system in popular 1 Series, 3 Series, and X1 models. This practical cap ensures a tight seal for the reservoir, protecting the fluid from contaminants and excessive evaporation, while also supporting the proper functioning of the entire system. Thanks to its OEM-compliant design, it is a safe service solution for repairs and replacements in original BMW installations.

Specifications and technical data

• SKU: 7075099-5
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7075099
• Substitutable numbers: 61667135409, 7135409, 61667075099, 7075099, 61664419445, 4419445
• Part type: Reservoir
• Category: Washer Pumps, Reservoirs & Nozzles

Purpose and Function in the BMW Washer System

The washer fluid reservoir cap is responsible for stable reservoir sealing, which reduces the risk of dirt, moisture, and other contaminants entering the system. In BMW E81, E82, E84, E87, E90, E91, and E92 vehicles, it is important for both operational and service purposes – a properly sealed reservoir helps maintain the correct working pressure in the pump supply area and ensures proper fluid delivery to the washer nozzles.

The original mounting geometry and shape of the cap are matched to the factory reservoirs used in these BMW generations, which facilitates installation and minimizes the risk of leaks resulting from the use of unsuitable aftermarket parts.

Construction, Fitment, and OEM Specifications

The presented cap belongs to the Washer Fluid Reservoirs, Pumps, and Nozzles group, meaning it is designed to work with the original reservoir, pump, and fluid lines. The construction based on BMW OEM standards ensures:

• compatibility with factory filler necks in the mentioned models,
• appropriate material stiffness and flexibility in working areas,
• consistent, secure closure with every opening and closing.

Additionally, the part has an assigned OEM number and associated interchangeable numbers, which facilitates precise identification by BMW catalog and selection of the correct part for a specific body type and model year.

Condition, Service Application, and Benefits of Installation

The item is offered as a used part, making it a sensible choice for economical repairs of the washer system in daily-driven BMW cars. Replacing a damaged or missing cap with an original component allows for:

• reducing fluid loss due to evaporation or splashing,
• decreasing the risk of nozzle clogging by contaminants entering the reservoir,
• maintaining the proper long-term operation of the washer pump.

For workshops and individual users, this means stable, predictable operation of the washer system without the need for unverified aftermarket parts.

Part Selection by Numbers and Technical Support

The BMW washer fluid reservoir cap is linked to a specific OEM part number and a set of interchangeable numbers, allowing for unambiguous identification in manufacturer catalogs and parts selection systems. In practice, this means that when fitting it to a specific vehicle, you can use either the OEM number or references used in other model versions, while maintaining full compliance with factory specifications.

If you want to deepen your knowledge on diagnostics and selection of service parts by OEM numbers, as well as learn about best service practices for supply systems, the article on our blog will be helpful: Fuel System – Injectors, Pumps, and Fuel Tank: Maintenance and Repair. Although it concerns a different system, it demonstrates universal principles of working with catalog numbers and service procedures.

Expanding Work on the BMW Washer System

If you are planning a comprehensive repair or upgrade of the washer system area in your BMW and need other parts from the same group, such as reservoirs, pumps, or nozzles, check the available parts in the BMW Washer Fluid Reservoirs, Pumps, and Nozzles category.

For drivers interested in a broader improvement of the car's characteristics – in terms of performance and dynamics – the tuning guide may offer additional inspiration: How to Increase Engine Power: A Practical Guide to Engine Tuning with Used Parts, which shows how to consciously use used components in more advanced vehicle modifications.