Genuine OEM Audi Pump for Reducing Agent, part number 8K0131899K. This pump is a key component of the selective catalytic reduction (SCR) system, responsible for injecting a reducing agent into the exhaust stream to reduce nitrogen oxide emissions. The pump has dimensions of 245mm x 120mm x 90mm. Genuine OEM pumps are calibrated for the precise flow rate and pressure required by the vehicle's emissions control system, ensuring compliance with environmental regulations.