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Product Information
Product Information
Check Valve for Windscreen washer (L-Shape)
This OE Match L-shape check valve is a replacement one-way valve used in the windscreen washer system on selected Porsche models. It is designed to control washer fluid flow through the washer hose circuit and helps prevent fluid from draining back into the reservoir.
Sold individually, quantity required depends on model and washer system layout

Fits:
Porsche 911 1981 - 1989
Porsche 964 1989 - 1994
Porsche 968 >> 1993
Porsche 924 1977 - 1988
Porsche 928 1978 - 1986
Porsche 944 1983 - 1991

Diagram ref no 29

The check valve allows washer fluid to flow in one direction toward the washer jets while stopping reverse flow when the washer system is not in use. This helps keep fluid closer to the spray nozzles, improving washer response when the windscreen washer is activated.

Functions:
Controls one-way washer fluid flow
 Helps prevent washer fluid from draining back through the hose
 Supports faster washer jet response
 Helps maintain washer system pressure
 Reduces delay before fluid reaches the windscreen
 Helps prevent air pockets in the washer line
 OE Match replacement for the original L-shape washer check valve.

Why Replace This Part?
A faulty check valve can allow washer fluid to drain back into the system, causing delayed spray, weak washer jet output, or no fluid delivery at first activation. The valve can also become blocked, cracked, brittle, or leak due to age, washer fluid additives, and engine bay heat. Replacing the check valve helps restore reliable washer operation and keeps the windscreen cleaning system working correctly.

When to replace:
  Washer fluid takes too long to reach the windscreen
  Washer jets spray weakly or inconsistently
  Fluid drains back after the washer system is used
  The valve is cracked, leaking, blocked, or brittle
  Washer hoses have been replaced or removed
  The washer system has air in the lines
  The windscreen washer system is being restored or repaired.

Where it fits on the car
This L-shape check valve fits in the windscreen washer hose circuit, between the washer reservoir/pump and washer jets. Depending on the model and washer hose layout, it may be positioned near the washer nozzles, under the front bonnet, or along the washer fluid line.

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477955481
477955481

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