Component: A combination of 1 x TP3018 fuel filter,1 x 12642623 fuel filter head,1 x 12639277 water in fuel indicator sensor. 12642623 Fuel filter head: Made of billet aluminum,electrophoresis process to protect it from oxidation and corrosion,easy to clean.Includes a heater plug.The aluminum air bleeder screw on the head which replaced plastic OEM screw was more durable.