When disinfecting a pipe, the chlorine solution is introduced at the point where the new main connects to the existing system through what component?

• A. Service Saddle
• B. Corporation Stop
• C. Gate Valve
• D. Tees and Fittings

Answer: (B)

Disinfecting a new main is done by introducing the chlorine at the tapping point where the new pipe connects to the existing system. The component that serves this purpose is the corporation stop, a valve mounted on the distribution main at the service connection that allows flow from the main into the new line and provides a port to inject disinfectant. Opening the corporation stop lets the chlorine solution enter the main and circulate through the system for proper disinfection. A service saddle is just the clamp that attaches the service line to the main and doesn’t provide an injection point. A gate valve is used to isolate sections of the pipe, not specifically to introduce disinfectant at the connection. Tees and fittings are simply joins and don’t offer a controlled injection point for disinfection.