What is referred to as the item that is "vacuumed" through a run when using a fish tape unit?

In the context of using a fish tape unit, the term that describes the item that is "vacuumed" through a run is the conduit piston. This component is specifically designed to help facilitate the movement and positioning of the fish tape within the conduit. The design allows for efficient navigation through bends and tight spaces in the conduit, enabling the tape to be pulled through by creating a vacuum effect that helps grip and guide it along its path.

Understanding the function of the conduit piston is essential in limited-energy cabling practices, as it provides the means to effectively route wires or cables through conduits without causing damage or obstruction. Proper use of this tool ensures smoother installations and helps technicians work more efficiently.