Part: Upper Exhaust Gas Recirculation (EGR) Tube
Vehicle Brands: Volkswagen, Audi, and Skoda
Example Fitment: Volkswagen Passat, Audi A4, and Skoda Superb

It is a metal pipe that is part of the EGR system, which helps recirculate exhaust gases to reduce emissions. 

Exhaust Gas Recirculation (EGR) Tube (Upper)
Part Number: 038131521CB
Supersession(s): 038-131-521-CB; 38131521CB

Volkswagen Passat 2.0L TDI-PD DIESEL A/T FWD GL TDI Sedan
2004, 2005
Volkswagen Passat 2.0L TDI-PD DIESEL A/T FWD GLS TDI Sedan
2004, 2005
Volkswagen Passat Wagon 2.0L TDI-PD DIESEL A/T FWD GL TDI Wagon
2004, 2005
Volkswagen Passat Wagon 2.0L TDI-PD DIESEL A/T FWD GLS TDI Wagon
2004, 2005

Exhaust Gas Recirculation (EGR) Tube. Pipe.
2.0 LITER. Exhaust Gas Recirculation (EGR) Tube.

Fits Passat, Passat Wagon