Usage Tips:Features: 1.OE Number: The referencing OE number of this heater control water valve are 4H0121671D, 4H0121671B, which is molded and designed depend on the data. 2.Fitment: The AC heater cooling solenoid valve is a replacement for A3 A4 Allroad A5 A6 A7 Q3 Q5 Q7 Q8 RS6 RS7 Sportback RSQ8 S3 S6 S7 S8. 3.Function: Regulate the amount of hot coolant that flows into the heater core, allowing for precise control of the temperature inside the car. 4.Energy Efficient: By controlling the amount of hot coolant that enters the heater core, the valve can help to save energy and lower fuel costs. 5.Ideal Replacement: Direct replacement installation, style, meets or exceeds OEM standards for the replacement of old and damaged one. Specification: Item Type: Heater Control Water Valve OE Number: 4H0121671D, 4H0121671B Material: Metal Fitment: Fits for A3 2015-2020 Fits for A4 2018-2020 Fits for A4 allroad 2018-2020 Fits for A5 2018- 2020 Fits for A5 Sportback 2018- 2020 Fits for A6 2012-2018 Fits for A7 2014-2018 Fits for A8 2011-2021 Fits for allroad 2013-2016 Fits for Q3 2015-2018 Fits for Q5 2013-2019 Fits for Q7 2013-2022 Fits for Q8 2019-2022 Fits for RS6 2021-2022 Fits for RS7 2014-2018 Fits for RS7 Sportback 2021-2022 Fits for RSQ8 2020-2022 Fits for S3 2015-2020 Fits for S6 2013-2018 Fits for S7 2013-2018 Fits for S8 2013-2021 Fits for SQ7 2020-2022 Fits for SQ8 2020- 2022 Fits for TT 2016-2018 Fits for TTS 2016-2018 Note: Please double check the part number of your item, matching information is for reference only. If you are unsure of the item, please contact us before buying to avoid unnecessary return, thanks!