#radiator_cap  cap on the opening in the top of a radiator through which a coolant liquid can be added
  supertype:  #cap.top  a top (as for a bottle)
  part of:  #radiator.mechanism  a mechanism consisting of a metal honeycomb through which hot fluids circulate; heat is transferred from the fluid through the honeycomb to the airstream that is created either by the motion of the vehicle or by a fan
     part of:  #engine_cooling_system__cooling_system__coolingsystem  equipment in a motor vehicle that cools the engine
        part of:  #motor_vehicle__motorvehicle__automotive_vehicle  a self-propelled wheeled vehicle that does not run on rails

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