Located on the charge air hoses on the input and output side of the intercooler. (64MM DIAMETER, ABOUT 2 1/2 inches)
This black seal ring is fitted to one end, on the INSIDE of hose connection and are only used on BlueTec engines ONLY. The opposite end connection uses the green OUTSIDE seal shown below. (May be a black or green colored seal)
On a 2.1L 4 Cyl engine, there are three of these seals.
On a 2010 and later 3.0L V6 engine there are four of these seals.