What is all piping after the gas meter outlet fitting commonly referred to as?

The term "fuel gas piping" encompasses all piping connected after the gas meter outlet fitting. This is the section that conveys the gas throughout the home or building, delivering it to various appliances and fixtures such as stoves, furnaces, and water heaters.

Understanding this terminology is crucial for identifying and maintaining the systems that distribute gas within structures. Since "fuel gas piping" specifically denotes the system responsible for the safe transport of gas from the meter to the appliance endpoints, it is a widely recognized term in industry standards and codes.

The other options, while related to gas systems, do not specifically capture the entirety of the piping after the meter. For example, "main supply pipeline" might suggest the primary line providing gas service but does not include the distribution lines serving different appliances. Similarly, "service access lines" and "pressure regulation lines" relate to specific functions within gas delivery systems rather than the comprehensive network for transporting gas after the meter. Therefore, "fuel gas piping" is the most accurate description for this context.