Radial shaft seal for the camshaft for all 2.0L TFSI engines such as Golf 5 GTI, Leon Cupra, etc.. If oil leaks at the above mentioned points, this should be replaced. We also recommend that you replace it every time you disassemble or reassemble the camshaft. Manufacturer Information about the manufacturer BAR-TEK BAR-TEK Motorsport GmbH Im Rauschen Auel 3, 51491 Overath-Brombach, Germany info@bar-tek.com