What propulsion device drives the nozzle of a jet rodder through the length of a sewer line?

The propulsion device that drives the nozzle of a jet rodder through the length of a sewer line is the reverse jet action of the nozzle. This mechanism is crucial for the operation of a jet rodder, which is used to clear blockages and clean sewer lines.

When water is ejected from the nozzle in a reverse direction, it creates thrust that pushes the nozzle forward through the pipe. This reverse jet action effectively propels the nozzle, allowing it to navigate bends and obstacles within the sewer line. The design of the nozzle is specifically engineered to maximize this thrust, making the cleaning process more efficient as the strong water jets help to break apart and flush away debris while simultaneously advancing the nozzle deeper into the line.

Understanding this principle of propulsion is essential for effectively using jet rodders in maintenance operations, as it directly relates to their efficiency and ability to clear waste in various pipe configurations. Other devices or mechanisms, such as those mentioned in the other options, do not contribute to the forward motion of the nozzle in the same manner as the reverse jet action does.