A conduit piston (mouse) is used for what application?

• A. Installing pull line
• B. Testing conduit integrity
• C. Pulling wire under load
• D. Removing old conduit

Answer: (A)

A conduit mouse is a push-through tool used to install a pull line through a run of conduit. You insert the mouse at one end and push it ahead through the conduit, typically with a rod or string, carrying a pull line to the far end. Once the pull line is in place, you can use it to pull wires through the conduit from the opposite end. This approach is especially handy for long or hard-to-feel runs where feeding a line from the exit isn’t practical. It isn’t meant for testing conduit integrity, removing old conduit, or pulling wire directly under load—those tasks require different tools or methods.