T25 Inlet Manifold Duct - 1.9 Waterboxer (DG Engine Code)

Replacement intake manifold intake duct for Volkswagen T3/T25 models fitted with the 1.9 DG waterboxer petrol engine and Pierburg carburettor. Mounted on top of the carburettor, this duct forms part of the intake system and is responsible for directing airflow cleanly into the engine.

This component is well known for becoming brittle, cracked or melted over time due to engine heat and age. Many original ducts have also been damaged by previous LPG conversions or temporary repairs using tape and sealants which can lead to vacuum leaks and poor engine performance.

A damaged intake duct can allow unmetered air into the intake system, causing unstable idle, hesitation, poor fuel economy and reduced engine performance. Replacing the duct restores proper airflow, intake sealing and smooth engine running while improving reliability of the carburettor system.

Manufactured as a direct replacement for the original part, this intake duct is designed to withstand the heat and vibration associated with the rear-mounted waterboxer engine.

Specifications:
• Intake manifold intake duct
• Fits Pierburg carburettor systems
• Durable heat-resistant construction
• Direct replacement fitment

Replaces OE Part Numbers:
• 025129654

Fitment:

VW Transporter T3 / T25 Bus, Van & Platform/Chassis (1982-1992)
• 1.9 Petrol DG 78PS

Suitable for watercooled 1.9 DG engine models fitted with Pierburg carburettors.

Function:
This intake duct connects to the upper section of the carburettor intake system, directing airflow into the engine while maintaining correct sealing and vacuum integrity.

Common Symptoms of Failure:
• Cracked or split intake duct
• Vacuum leaks
• Poor idle quality
• Hesitation under acceleration
• Reduced engine performance
• Temporary tape repairs from previous damage

Additional Parts That May Be Required During Fitting:
• Carburettor mounting gasket
• Vacuum hoses
• Intake hose clips
• Breather hoses
• Pierburg carburettor service parts