This is the radiator cap that is used on 1950-1971 CJ models with the 4 cylinder 148 & 161 6 cylinder and 1950-1963 Pick Up Truck, Station Wagon, Sedan Delivery, Jeepster and FC models. On some early utility models this cap may be used. The inside measures 1 1/2".

Note: This is note used on V6 models They use a higher pound cap.

1 Required per Jeep.