CTS is proud to release our -8AN O-Ring Boss Plug, this fitting is used when installing fuel rails on returnless fuel systems such as the B6 A4 1.8T.
Product details:
-8AN O-ring boss
Includes O-ring
Black anodized finish
Fitment per CTS description: used when installing fuel rails on returnless fuel systems such as the B6 A4 1.8T (example application; no structured fitment).