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Porsche > Cayenne 9YA (E3) 2018-2023 > 9YA Cayenne Coupe E-Hybrid V6 3.0L (340Hp) 2020-23 > Electrical & Relays > Washer pumps / bottles / jets >

Check Valve for Windscreen washer (L-Shape). Porsche 911 / 964 / 968 / 924 / 944 / 928 ❭ 477955481

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Porsche

477955481

Product Information

Check Valve for Windscreen washer (L-Shape)
This is a Genuine Porsche OE check valve / L-shape washer valve for the windscreen washer system. It is designed as a small inline valve fitted into the washer-fluid hose circuit. The L-shaped design allows the washer hose to be routed neatly while maintaining correct washer-fluid flow direction.
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

This valve fits in the windscreen washer-fluid hose system, between the washer fluid supply and the windscreen washer jets. It is used as an inline check valve/connector in the front washer pipework and helps maintain correct fluid direction and hose routing.

The washer check valve can become blocked, brittle, cracked or internally worn over time. When it fails, the washer jets may respond slowly, spray weakly, leak fluid back through the line or stop delivering washer fluid correctly. Replacing the valve with a Genuine Porsche OE L-shape check valve helps restore correct washer-fluid flow and keeps the windscreen washer system operating as intended. This is especially important for safe visibility in poor weather or dirty road conditions.

When to replace:
• If the washer jets have delayed spray after activation
• If washer-fluid pressure is weak or inconsistent
• If fluid drains back from the washer lines
• If the original valve is cracked, brittle or leaking
• If the washer hose connection is loose or damaged
• During washer hose, washer jet or washer pump repairs
• When restoring the windscreen washer system to OE specification.

Related reference numbers
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477955481

477955481

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Hose Line For Washer, Front. Porsche 9YA / 9YA.2 Cayenne 2018>>

9Y0955744P

Product Information

Hose Line For Washer, Front.

The Hose Line for Washer, Front is a genuine OEM washer system hose designed specifically for the front windshield washer system on the Porsche Cayenne 2018>>.
This front washer hose line carries washer fluid from the reservoir and pump to the front windshield washer jets, ensuring proper fluid delivery when the washer function is activated. Made to factory specifications, this hose provides a precise fit with correct diameter, seals, and routing clips to match the original installation.
Manufactured from high-quality automotive-grade materials, it resists heat, cold, repeated flexing, and exposure to washer fluid chemicals — helping maintain reliable performance and long service life.

Fits:

Porsche 9YA Cayenne V6 3.0L Petrol 340Hp 2018-23
Porsche 9YA Cayenne Coupe V6 3.0L Petrol 340Hp 2019-23
Porsche 9YA Cayenne E-Hybrid V6 3.0L V6 340Hp 2018-23
Porsche 9YA Cayenne Coupe E-Hybrid V6 3.0L 340Hp 2020-23
Porsche 9YA Cayenne S V6 2.9L Petrol 440Hp 2018-23
Porsche 9YA Cayenne Coupe S V6 2.9L Petrol 440Hp 2019-23
Porsche 9YA Cayenne GTS V8 4.0L Petrol 460Hp 2020-23
Porsche 9YA Cayenne Coupe GTS V8 4.0L Petrol 460Hp 2021-23
Porsche 9YA Cayenne Turbo V8 4.0L Petrol 550Hp 2020-23
Porsche 9YA Cayenne Coupe Turbo V8 4.0L Petrol 550Hp 2019-23
Porsche 9YA Cayenne Turbo S E-Hybrid V8 4.0L 550Hp 2019-23
Porsche 9YA Cayenne Coupe Turbo S E-Hybrid V8 4.0L 550Hp 2020-23
Porsche 9YA Cayenne Coupe Turbo GT V8 4.0L 640Hp 2021-23
Porsche 9YA.2 Cayenne V6 3.0L Petrol 353Hp 2023>>
Porsche 9YA.2 Cayenne Coupe V6 3.0L 353Hp 2023>>
Porsche 9YA.2 Cayenne E-Hybrid V6 3.0L 470Hp 2023>>
Porsche 9YA.2 Cayenne E-Hybrid Coupe V6 3.0L 470Hp 2023>>
Porsche 9YA.2 Cayenne S V8 4.0L Petrol 474 Hp 2023>>
Porsche 9YA.2 Cayenne S Coupe V8 4.0L 474Hp 2023>>
Porsche 9YA.2 Cayenne S E-Hybrid V6 3.0L 519Hp 2023>>
Porsche 9YA.2 Cayenne S E-Hybrid Coupe V6 3.0L 519Hp 2023>>
Porsche 9YA.2 Cayenne Turbo E-Hybrid V8 4.0L 739Hp 2023>>
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Diagram Ref No 3

What This Product Does:

Delivers washer fluid from the front washer pump to the front windscreen jets
Ensures consistent fluid flow and pressure for effective cleaning
Serves as part of the washer system plumbing alongside the pump, reservoir, and spray nozzles
Prevents fluid leaks and ensures jets operate as designed
OEM design means correct length, diameter, and connection points for a direct fit

Symptoms Of Hose Failure:

No washer spray from the front windscreen jets
Weak, intermittent, or uneven spraying
Visible washer fluid leaks under the front of the vehicle or in the engine bay
Washer fluid reservoir depletes quickly with little or no fluid reaching the jets
Hose looks cracked, brittle, bent, or collapsed on inspection
Washer pump sounds normal yet no fluid sprays

Why Replacement Matters:

A functioning washer system is vital for removing rain, dirt, road film, bug splatter, and other debris — crucial for maintaining unobstructed windscreen visibility and safe driving in changing road conditions.
If the hose is leaking or blocked, the washer pump may run dry or under stress, which can lead to premature wear or failure of the washer motor — a more expensive part to replace.
Using the genuine part ensures the correct fit, sealing surfaces, connection diameter, and routing clips, avoiding leaks and improper alignment that can occur with generic hoses.
Factory-specified materials resist temperature extremes and chemical exposure, meaning this hose stays flexible and leak-free longer than inferior replacements.
Even minor plumbing components contribute to a well-maintained vehicle. A fully functioning washer system reflects good maintenance and supports overall vehicle condition and resale value.

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

9Y0955744P

9Y0955744

9Y0955744P

The product you are viewing cross references to these numbers

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Check Valve for Windscreen washer (L-Shape). Porsche 911 / 964 / 968 / 924 / 944 / 928 ❭ 477955481