026129820 Mushroom Valve Diaphragm for Air Filter 035129607K / 050129607E / 026129607
The 026129820 mushroom valve diaphragm is a replacement air filter system valve component for applications using 035129607K, 050129607E and 026129607. This part is designed to restore the function of the existing mushroom valve in the air filter system without replacing the complete housing.
This product is a mushroom valve diaphragm only. It should not be treated as a PCV membrane, oil separator diaphragm or valve cover component.
OEM / Reference Numbers
Primary OEM: 026129820
Supporting OEM / Air Filter References:
- 035129607K
- 050129607E
- 026129607
Part Type
- Mushroom valve diaphragm
- Air filter valve diaphragm
- Air filter mushroom valve
- Air intake valve membrane
What This Part Does
This diaphragm works as part of the mushroom valve used in the air filter system. When the original diaphragm becomes worn, brittle or damaged, the valve may no longer operate correctly. Replacing the diaphragm helps restore the function of the existing air filter valve unit in a targeted and cost-effective way.
Compatible Vehicles
- Audi 100 / Avant 1983–1991
- Audi 100 / Avant quattro 1988–1991
- Audi 80 / 90 / Avant 1982–1996
- Audi 80 / 90 / Avant quattro 1987–1992
- Audi Coupe 1981–1988
- Volkswagen Caddy 1983–1992
- Volkswagen Golf 1982–1992
- Volkswagen Golf Cabriolet 1982–1993
- Volkswagen Golf / Variant / syncro / Rall. / Coun. 1986–1991
- Volkswagen Jetta 1982–1992
- Volkswagen Passat / Variant / Santana 1982–1993
- Volkswagen Scirocco 1982–1992
Please verify OEM number, vehicle model, production year and air filter valve design before ordering.
Engine / Engine Family / Technical Detail
- OEM focus: 026129820
- Supporting air filter references: 035129607K, 050129607E, 026129607
- Part format: diaphragm / valve component only
Common Symptoms of Failure
- Air filter valve not operating correctly
- Worn or damaged mushroom valve diaphragm
- Need to repair the existing valve instead of replacing the full housing
- Air intake system function affected by valve diaphragm wear
Why Choose This Replacement
- Targets exact OEM search intent for 026129820
- Supports repair of the existing air filter mushroom valve
- Cost-effective alternative to replacing the complete valve housing
- Matches classic Audi and Volkswagen air filter applications
Important Before Ordering
- Verify OEM 026129820 against your original part
- Check supporting references 035129607K, 050129607E or 026129607 where applicable
- Confirm your vehicle model, year and air filter valve design before ordering
- Make sure you need the mushroom valve diaphragm only, not the complete air filter housing
What does 026129820 fit?
026129820 is listed for selected Audi 100, Audi 80/90, Audi Coupe, Volkswagen Caddy, Golf, Golf Cabriolet, Jetta, Passat and Scirocco applications within the specified year ranges.
Is 035129607K the same type of part as 026129820?
035129607K is listed as an air filter reference used with this 026129820 mushroom valve diaphragm application.
What does this mushroom valve diaphragm do?
It helps the mushroom valve in the air filter system operate correctly. A damaged diaphragm can reduce proper valve function inside the existing air filter assembly.
Is this a complete air filter assembly or diaphragm only?
This product is the mushroom valve diaphragm only. It is intended to repair the existing valve rather than replace the complete air filter housing.
Is this part a PCV membrane or oil separator diaphragm?
No. This product is a mushroom valve diaphragm for the air filter system and should not be confused with PCV or oil separator parts.
How do I confirm compatibility before ordering?
Match OEM 026129820 with your original part, compare air filter references 035129607K, 050129607E or 026129607 if needed, and verify your vehicle model, year and valve design before ordering.
Read All
Orders ship within 1–2 business days.
Standard delivery:
- USA: Some items ship from our US warehouse and arrive within 3 business days.
- USA-EU: 10–21 business days
- Worldwide: 14–30 business days
Shipping cost is shown at checkout.
Can I exchange or return an item?
Yes, you can exchange or return an item within 14 days of purchase. This right is guaranteed to you by the Law on the Protection of Consumer Rights
To use this feature, please make sure that:
- the product was not in use and has no traces of use: scratches, chips, abrasions, etc.
- the goods are fully completed and the integrity of the packaging is not violated
- retained all labels and factory markings