What type of valve should be installed at the tap-off of the main gas line?

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The appropriate type of valve to be installed at the tap-off of the main gas line is indeed the curb valve. This valve is specifically designed to isolate the gas supply from the public main or utility service and is typically installed outdoors or in an accessible location. Its primary function is to allow utility companies to easily shut off gas service when necessary, such as during maintenance or emergencies.

Curb valves are crucial for ensuring safety and maintaining control over gas flow, as they provide a point for the utility to access the gas supply without requiring entry into the property. In various codes and standards for plumbing and gas installations, the use of a curb valve at the main gas line connection is often mandated to ensure the gas system can be safely and efficiently managed by the service providers.

Alternative valves, while functional in their own right, serve different purposes. For instance, a ball valve is often favored for on/off control due to its ability to quickly shut off flow, but it does not have the same utility access feature as a curb valve. Similarly, a check valve prevents backflow, which is critical in certain plumbing applications, but it does not serve the purpose of isolating the service line. A shutoff valve is used within a system to control flow at specific

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