What tool is required when installing a nohub joint?

When installing a nohub joint, a torque wrench is essential because it allows you to apply the correct amount of force to the coupling clamps that secure the joint. Nohub joints, which are often used in cast iron pipe installations, require precise torque settings to ensure a secure and leak-free connection. The torque wrench enables the contractor to tighten the clamps to the manufacturer's specifications, preventing potential issues such as leaks caused by overtightening or insufficient tightening.

Using a torque wrench not only helps achieve the right tightness but also adheres to relevant plumbing codes and safety standards, ensuring the installation is both safe and reliable. Other tools listed, such as a pipe wrench or screwdriver, do not provide the necessary level of precision for this specific application, while a plunger is unrelated to the task at hand. Thus, a torque wrench is the appropriate tool for installing a nohub joint.