Water bottle washer jets filler neck cap. Porsche 911/ 993 / 964

Washer bottle filler neck cap / Windscreen washer reservoir cap.
Washer bottle filler neck cap is an replacement designed to close and seal the windscreen washer fluid reservoir on classic Porsche models. It reproduces the original cap’s diameter, profile and locking design, ensuring a snug fit on the filler neck and a neat, factory-correct appearance in the luggage compartment.

Fits:
Porsche 911 1974 - 1989
Porsche 964 1989 - 1994
Porsche 993 1994 - 1998

Diagram Ref no 9.

This cap seals the top of the washer fluid reservoir to:
• Prevent washer fluid from splashing or spilling out of the tank.
•  Keep dirt, dust and moisture from entering the washer system.
•  Help maintain correct fluid level and cleanliness for reliable jet performance.

Over time, the original washer bottle cap can become brittle, cracked, loose or go missing altogether. When that happens:
•  Washer fluid can splash or slosh out under braking or cornering.
•  Dirt and debris can fall into the tank, potentially clogging jets or damaging the pump.
•  You may notice more frequent low fluid levels or contamination in the reservoir.

Replacing it with a correct cap restores a secure closure, protects the washer system, and keeps the front luggage area looking complete and factory-correct. 

You should replace the cap if the original is missing, cracked, or no longer clips on securely. A new cap is also recommended if dirt or debris has entered the washer tank due to poor sealing. It’s an ideal replacement during restoration or detailing work as well, especially when aiming to keep the luggage compartment on a classic 911, 964 or 993 looking fully OEM and complete.


Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

96420150700

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