Mushroom PCV Valve Diaphragm – VAG | OEM 026129820 | Air Filter 035129607K 050129607E 026129607

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

• Audi
• Volkswagen

Returns and exchanges

Request a change-of-mind return within 14 calendar days of delivery, then send the goods within 14 calendar days of notifying us. Our voluntary return option applies to unused, uninstalled, complete goods in their original condition and packaging. Exchanges are subject to availability and agreement.

The customer pays change-of-mind return shipping. No restocking fee applies. Refunds and original delivery charges are handled under our Refund & Return Policy and applicable law.

Faulty, damaged or incorrect goods

Email contact-us@klifex.net with your order details and a description of the problem. These claims are separate from change-of-mind returns. Where we are responsible, we bear the required remedy and return costs. Installation alone does not remove mandatory defect rights.

Your legal rights

Applicable statutory rights take precedence, including EU/EEA and UK withdrawal rights and legal guarantees. Necessary inspection does not remove a statutory withdrawal right; deductions for excessive handling must reflect an actual, evidenced loss of value.

Contact us for the correct return address before shipping. Our legal address is not a return address.

Read the full Refund & Return Policy