What does a gas line look like and how can it be identified in a residential or commercial setting?

A gas line is typically a metal pipe that carries natural gas to appliances in a building. In a residential or commercial setting, gas lines are often located near water heaters, stoves, or furnaces. They can be identified by their metal material, usually painted yellow, and may have a shut-off valve nearby. It is important to never tamper with or attempt to repair a gas line yourself, and to contact a professional if there are any concerns about gas leaks.