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Clevis, ring, and single hook are types of:

  1. Connectors for gas valves

  2. Furnace clamps

  3. Hanger to support gas piping

  4. Vent terminations

The correct answer is: Connectors for gas valves

The correct answer identifies clevis, ring, and single hook as types of connectors for gas valves. These components are essential in the installation and support of gas valves in various systems. They help ensure that the valves are securely connected and can operate reliably without failure due to improper installation. When considering the context of the other options, it's clear that clevis, ring, and single hook do not fit into categories like furnace clamps or vent terminations, which are used for entirely different functions in gas systems. Hangers to support gas piping would typically refer to brackets or devices specifically designed to hold or suspend piping in place, not the specific connectors used for valves. The correct selection emphasizes the role of these connectors in maintaining the integrity and operation of gas systems.