What is the correct method for interconnecting a sewer service pipe to a sewer main?

The correct method for interconnecting a sewer service pipe to a sewer main is to use a saddle clamp for connection. This technique is commonly employed because it allows for a secure and watertight connection without compromising the integrity of the sewer main. A saddle clamp is designed to fit around the existing pipe, creating a branch off the mainline without needing to cut or punch a hole, which can introduce potential weaknesses and contamination risks.

Utilizing a saddle clamp is advantageous as it maintains the structural integrity of the sewer main, minimizes the risk of leaks, and often complies with local plumbing codes and regulations. This method also allows for easier maintenance and inspection of both the service line and the main sewer line. It's essential to ensure that the clamp is installed according to the manufacturer's specifications and that appropriate tools are used to tighten the connections securely.

The other methods mentioned, such as punching a hole or welding the pipe directly, can lead to structural issues or improperly sealed connections, which could contribute to sewer leaks or increased maintenance needs.