Genuine OEM Volkswagen Reduction Agent Tank, part number 561131877H. This tank stores and heats the reduction agent, such as AdBlue, used in selective catalytic reduction (SCR) systems to reduce harmful NOx emissions. It is located in the SCR system assembly. This part weighs 4.035 kg and has dimensions of 0.45m x 0.26m x 0.12m. Genuine OEM tanks are manufactured to precise specifications for optimal performance and longevity in emission control systems.