What is the correct identification for the part labeled A in a plumbing figure?

The part labeled A, identified as a Corporation Stop, is a crucial component in plumbing systems, particularly in water supply installations. A Corporation Stop is a valve installed in the service line between the water main and the customer’s meter. Its primary function is to control the flow of water from the municipal water supply into a residential or commercial property.

This type of valve is generally located beneath the street and connects directly to the municipal water supply. When service or maintenance is required for a specific property, the Corporation Stop allows for the isolation of the water supply without affecting the entire street's water service.

In understanding the context of other plumbing components, it is essential to note their functions in relation to the Corporation Stop. For example, a Curb Stop is typically installed at the curb and serves as a cutoff for the main supply line to the property but does not directly connect to the meter service line. A Meter Stop is designed to isolate the meter itself for repairs or replacement but is downstream of the Corporation Stop and tied directly to the individual property’s service. A Gate Valve, while also a type of valve used to control flow, is not specifically used for the connection to the municipal water supply and is generally found within the building’s plumbing system.

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