What is a self-tightening wrench mounted at the end of a torque tube called?

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A self-tightening wrench mounted at the end of a torque tube is known as a basin wrench. This type of wrench is specifically designed to reach and grip nuts in tight spaces, such as those found under sinks where plumbing fixtures are installed. The unique mechanism of the basin wrench allows it to tighten or loosen nuts without needing a full rotation, making it particularly useful in confined areas.

The self-tightening feature of the basin wrench means that as it is turned, the object being gripped is held firmly, allowing for efficient and effective adjustment. This is especially advantageous in plumbing work, where space constraints are common and proper torque application is necessary to ensure a secure fit.

In contrast, other types of wrenches, such as box wrenches or crescent wrenches, serve different purposes and may lack the specific design elements that facilitate working in tight plumbing situations. A chain wrench, on the other hand, is typically used for gripping round objects and would not specifically be mounted on a torque tube in the context described. Thus, basin wrenches are the ideal tool for the job laid out in the question.

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