Compatibility Notice: As vehicle models, model years and specifications vary, we recommend that you carefully check whether the product matches the parts required for your vehicle to ensure that the dimensions, connectors, functions and product codes are compatible; this will ensure that the product can be correctly installed in your vehicle. Customer Support: If you have any questions regarding the purchase, installation or use of the product, please feel free to contact us via the channels provided on our website. We will provide you with a solution within 24 hours. Compatibility : for Allroad 2013 2014 2015 2016; for TT 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014; Materials: The vacuum switching valve solenoid is made of reliable special materials, possessing stability and long-term usability; Features: The vacuum solenoid valve adopts a normally closed or normally open working mode, utilizing the medium pressure difference to complete the opening and closing action, featuring for zero leakage, explosion-proof design, and corrosion resistance., Manufacturer: YSERFVX-1