Porsche Cayman 987C Windscreen Washer Fluid Filler Neck Cap 99652860500

Porsche Cayman 987C Windscreen Washer Fluid Filler Neck Cap is an original component of the windscreen cleaning system, designed for the factory washer fluid reservoir in Porsche models. Thanks to its precise fit to the vehicle's design, it ensures a tight seal of the filler neck, stable fluid management, and maintains the proper operation of the washers during daily use. This is a practical solution for users who want to restore the full functionality of the washer system while maintaining the manufacturer's original specifications.

Specifications and technical data

• SKU: 99652860500-1
• Mark: Porsche
• Condition: Used
• OEM Part Number: 99652860500
• Substitutable numbers: 99652860500, 996 528 605 00
• Part type: Reservoir
• Category: Washer Pumps, Reservoirs & Nozzles

Purpose and technical function

The presented cap is a component from the Washer fluid reservoirs, pumps, and nozzles group, responsible for tightly sealing the fluid filler neck in the windscreen washer system. Its purpose is to:

• limit evaporation and uncontrolled fluid loss,
• protect the interior of the reservoir from external contaminants,
• maintain stable operating pressure in the washer system,
• ensure convenient access to the filler neck when refilling fluid. By using an original solution, compatibility with the factory reservoir and other components of the washer system in the Porsche Cayman 987C is maintained.

Benefits of using an original cap

Using an original washer fluid filler neck cap in a Porsche offers a number of practical advantages:

• Factory geometric fit – the cap works with the filler neck socket according to the manufacturer's design, which minimizes the risk of leaks.
• Stable washer system operation – proper sealing of the reservoir helps maintain the right conditions for the pump and nozzles.
• Consistency with the original engine bay appearance – the element visually and structurally corresponds to the factory Porsche standard.
• A sensible service solution – a used, original component allows for restoring functionality without the need to use replacements with uncertain parameters.

Component condition and service application

The offered cap comes from disassembly and is a used part, which makes it an attractive alternative to new replacements while maintaining the original Porsche design. It works well both as a replacement element in case of damage or wear of the existing cap, and when completing missing washer system components after body or mechanical repairs. Selecting the part is facilitated by the manufacturer's marking and assignment to a specific Porsche reference, which allows for precise matching to a given vehicle model without the need for modifications.

Application in the vehicle's operational system

A functional washer fluid filler neck cap has a direct impact on driving comfort and safety – it enables the maintenance of the proper fluid level, which translates into effective window cleaning in various weather conditions. Combined with efficient washer pumps and nozzles, the driver gains:

• clear visibility of the windshield during rain, snow, and road dirt,
• stable operation of the entire system without air locks or uncontrolled leaks,
• easy service handling when refilling operating fluid. If you are planning a comprehensive repair or upgrade of the window cleaning zone and engine bay in your Porsche and need other elements from the same group, such as reservoirs, pumps, or washer nozzles, check the available parts in the Porsche washer fluid reservoirs, pumps, and nozzles category.

Additional technical support and knowledge

When selecting operational components for Porsche-class vehicles, it is worth using reliable sources of knowledge regarding operating fluid systems and their maintenance. In the context of working with supply systems and selecting components by manufacturer numbers, an article describing the diagnostics and maintenance of the fuel system may be helpful – you will find practical information there about the operation of pumps, tanks, and methods of identifying parts by OEM markings: Fuel system – injectors, pumps, and fuel tank: maintenance and regeneration.