The CTS Gen3 Jetta Intake Adapter is used when connecting the CTS-IT-220.3 intake kit to the OEM rear PCV connection. This part comes as pictured with the 1″ silicon connection to easily slide over the connection on your CTS-IT-220.3. This is a replacement part and is included with each CTS-IT-220.3 when purchased new from CTS and our dealers.nnNot required for CTS-IT-220R